Images not appearing on the same line with display:inline-block - html

In order to position two images beside each other (i.e. the two images are on the same line), I tried the following code:
<html>
<head>
<style>
#container {
width:100%;
}
img {
display:inline-block;
width:50%;
}
</style>
</head>
<body>
<h1 style="text-align:center"><strong>Test</strong></h1>
<div id="container">
<img src="Google-logo.png">
<img src="Google-logo.png">
</div>
</body>
The width of the container div should be shared equally by the two images, right? However, this does not happen and the images appear on two separate lines.
If, however, I use float:left instead, the images do appear on the same line. Why is this?


Remove the new line between the img tags:
<div>
<img src="..." alt=""><img src="..." alt="">
</div>
This happens because elements which are declared with inline or inline-block are sensitive to whitespace.
More information: on David Walsh's Blog
Commonly layouts are done with floats or flexbox instead.
Floats
/* Clearfix */
.wrapper:after {
content: '';
display: table;
clear: both;
}
.item {
float: left;
width: 50%;
height: 100px;
}
.item-1 {
background: red;
}
.item-2 {
background: blue;
}
<div class="wrapper">
<div class="item item-1"></div>
<div class="item item-2"></div>
</div>
Flexbox
.wrapper {
display: flex;
}
.item {
flex: 1; /* Or use width: 50%; */
height: 100px;
}
.item-1 {
background: red;
}
.item-2 {
background: blue;
}
<div class="wrapper">
<div class="item item-1"></div>
<div class="item item-2"></div>
</div>


try this code
#container {
max-width:100%;
display:flex;
}
img {
flex:1;
}


Give align property to images.
<img src="Google-logo.png" align="left">
<img src="Google-logo.png" align="left">
https://jsfiddle.net/bt2341yh/


use css float property:
img {
width:50%;
float:left;
}
see fiddle . no need of display.


Images give margins and padding so giving 50% width wont bring them in a line. Try reducing their widths or add float:left.
img{
display: inline-block;
width: 50%;
float: left;
}


According to the above solution it is very difficult to keep the page next to next line content. It will looks like minified version of our code. So try to add font-size:0 on your parent element #container. This will resolve this issue.
#container {
width:100%;
font-size:0;
}
DEMO

Related

Floating child div to fill only remaining space

I want that yellow box to fill all the available space both vertically and horizontally without overlaying the picture.
(I'm trying to do it without using table properties)
Any ideas?
This is how it looks now:
and this is what i want:
.content-block-body{
width: 100%;
background-color: brown;
overflow:auto;
}
.content-block-text{
float:left;
background-color: red;
padding:2%;
}
.content-block-image{
background-color: greenyellow;
float: right;
}
<div class="content-block-body">
<div class="content-block-text">
<div>月額固定と成果報酬が選べます</div>
<div>成果報酬額に上限おもうけられます</div>
<div>料金が明瞭で予算に合わせた対策が可能</div>
</div>
<div class="content-block-image"> <img src="image-1.jpg"> </div>
</div>

The problem is the float: left makes the yellow area not "stretch." To make the image float to the right of the text, it has to come before the text. So we change the order of the content blocks:
<div class="content-block-body">
<div class="content-block-image"> <img src="image-1.jpg"> </div>
<div class="content-block-text">
<div>月額固定と成果報酬が選べます</div>
<div>成果報酬額に上限おもうけられます</div>
<div>料金が明瞭で予算に合わせた対策が可能</div>
</div>
</div>
And then adjust the css:
.content-block-body {
width: 100%;
background-color: brown;
overflow:auto;
}
.content-block-text{
/*float:left;*/ /* this we remove */
background-color: red;
padding:2%;
/* this we add: */
overflow: auto;
}
.content-block-image{
background-color: greenyellow;
float: right;
}
Note that whenever you float things you'll most likely need to add what's called a "clearfix". In this case, apply the clearfix to the .content-block-body to make it extend vertically to fit the floated element http://nicolasgallagher.com/micro-clearfix-hack/

You have to specify width of left block and right block in CSS and make image width 100%
.content-block-body{
width: 100%;
background-color: brown;
overflow:auto;
}
.content-block-text{
float:left;
background-color: yellow;
padding:2%;
width:56%;
}
.content-block-image{
background-color: greenyellow;
float: right;
min-width:200px;
width:40%;
}
.content-block-image img{
width:100%;
}
<div class="content-block-body">
<div class="content-block-text">
<div>月額固定と成果報酬が選べます</div>
<div>成果報酬額に上限おもうけられます</div>
<div>料金が明瞭で予算に合わせた対策が可能</div>
</div>
<div class="content-block-image"> <img src="image-1.jpg"> </div>
</div>

You can use css3 flex. That's the only thing that works just fine when it comes to getting the height of the parent node for child node. All the hacks for old browsers doesn't work always.
.content-block-body{
width: 100%;
background-color: brown;
overflow:auto;
display: flex;
clear: both;
}
.content-block-text{
float:left;
background-color: red;
align-items: stretch;
}
.content-block-image{
flex: 1;
background-color: greenyellow;
}
.content-block-image img{
float: right;
}
<div class="content-block-body">
<div class="content-block-text">
<div>月額固定と成果報酬が選べます</div>
<div>成果報酬額に上限おもうけられます</div>
<div>料金が明瞭で予算に合わせた対策が可能</div>
</div>
<div class="content-block-image">
<img src="//placehold.it/250x250">
</div>
</div>
also check out this cool site for code snippets on centering in css.

Css main tag resize when aside min-width: 200px [duplicate]

I want a two-column div layout, where each one can have variable width e.g.
div {
float: left;
}
.second {
background: #ccc;
}
<div>Tree</div>
<div class="second">View</div>
I want the 'view' div to expand to the whole width available after 'tree' div has filled needed space.
Currently, my 'view' div is resized to content it contains
It will also be good if both divs take up the whole height.
Not duplicate disclaimer:
Expand div to max width when float:left is set
because there the left one has a fixed width.
Help with div - make div fit the remaining width
because I need two columns both aligned to left

The solution to this is actually very easy, but not at all obvious. You have to trigger something called a "block formatting context" (BFC), which interacts with floats in a specific way.
Just take that second div, remove the float, and give it overflow:hidden instead. Any overflow value other than visible makes the block it's set on become a BFC. BFCs don't allow descendant floats to escape them, nor do they allow sibling/ancestor floats to intrude into them. The net effect here is that the floated div will do its thing, then the second div will be an ordinary block, taking up all available width except that occupied by the float.
This should work across all current browsers, though you may have to trigger hasLayout in IE6 and 7. I can't recall.
Demos:
Fixed Left: http://jsfiddle.net/A8zLY/5/
Fixed Right: http://jsfiddle.net/A8zLY/2/
div {
float: left;
}
.second {
background: #ccc;
float: none;
overflow: hidden;
}
<div>Tree</div>
<div class="second">View</div>

I just discovered the magic of flex boxes (display: flex). Try this:
<style>
#box {
display: flex;
}
#b {
flex-grow: 100;
border: 1px solid green;
}
</style>
<div id='box'>
<div id='a'>Tree</div>
<div id='b'>View</div>
</div>
Flex boxes give me the control I've wished css had for 15 years. Its finally here! More info: https://css-tricks.com/snippets/css/a-guide-to-flexbox/

Use the CSS Flexbox flex-grow property to fill the remaining space.
html, body {
height: 100%;
}
body {
display: flex;
}
.second {
flex-grow: 1;
}
<div style="background: #bef;">Tree</div>
<div class="second" style="background: #ff9;">View</div>

This would be a good example of something that's trivial to do with tables and hard (if not impossible, at least in a cross-browser sense) to do with CSS.
If both the columns were fixed width, this would be easy.
If one of the columns was fixed width, this would be slightly harder but entirely doable.
With both columns variable width, IMHO you need to just use a two-column table.

Use calc:
.leftSide {
float: left;
width: 50px;
background-color: green;
}
.rightSide {
float: left;
width: calc(100% - 50px);
background-color: red;
}
<div style="width:200px">
<div class="leftSide">a</div>
<div class="rightSide">b</div>
</div>
The problem with this is that all widths must be explicitly defined, either as a value(px and em work fine), or as a percent of something explicitly defined itself.

Check this solution out
.container {
width: 100%;
height: 200px;
background-color: green;
}
.sidebar {
float: left;
width: 200px;
height: 200px;
background-color: yellow;
}
.content {
background-color: red;
height: 200px;
width: auto;
margin-left: 200px;
}
.item {
width: 25%;
background-color: blue;
float: left;
color: white;
}
.clearfix {
clear: both;
}
<div class="container">
<div class="clearfix"></div>
<div class="sidebar">width: 200px</div>
<div class="content">
<div class="item">25%</div>
<div class="item">25%</div>
<div class="item">25%</div>
<div class="item">25%</div>
</div>
</div>

Here, this might help...
<html>
<head>
<style type="text/css">
div.box {
background: #EEE;
height: 100px;
width: 500px;
}
div.left {
background: #999;
float: left;
height: 100%;
width: auto;
}
div.right {
background: #666;
height: 100%;
}
div.clear {
clear: both;
height: 1px;
overflow: hidden;
font-size: 0pt;
margin-top: -1px;
}
</style>
</head>
<body>
<div class="box">
<div class="left">Tree</div>
<div class="right">View</div>
<div class="clear" />
</div>
</body>
</html>

If the width of the other column is fixed, how about using the calc CSS function working for all common browsers:
width: calc(100% - 20px) /* 20px being the first column's width */
This way the width of the second row will be calculated (i.e. remaining width) and applied responsively.

I don't understand why people are willing to work so hard to find a pure-CSS solution for simple columnar layouts that are SO EASY using the old TABLE tag.
All Browsers still have the table layout logic... Call me a dinosaur perhaps, but I say let it help you.
<table WIDTH=100% border=0 cellspacing=0 cellpadding=2>
<tr>
<td WIDTH="1" NOWRAP bgcolor="#E0E0E0">Tree</td>
<td bgcolor="#F0F0F0">View</td>
</tr>
</table>
Much less risky in terms of cross-browser compatibility too.

<html>
<head>
<style type="text/css">
div.box {
background: #EEE;
height: 100px;
width: 500px;
}
div.left {
background: #999;
float: left;
height: 100%;
width: auto;
}
div.right {
background: #666;
height: 100%;
}
div.clear {
clear: both;
height: 1px;
overflow: hidden;
font-size: 0pt;
margin-top: -1px;
}
</style>
</head>
<body>
<div class="box">
<div class="left">Tree</div>
<div class="right">View</div>
<div class="right">View</div>
<div style="width: <=100% getTreeWidth()100 %>">Tree</div>
<div class="clear" />
</div>
<div class="ColumnWrapper">
<div class="Colum­nOne­Half">Tree</div>
<div class="Colum­nOne­Half">View</div>
</div>
</body>
</html>

You can try CSS Grid Layout.
dl {
display: grid;
grid-template-columns: max-content auto;
}
dt {
grid-column: 1;
}
dd {
grid-column: 2;
margin: 0;
background-color: #ccc;
}
<dl>
<dt>lorem ipsum</dt>
<dd>dolor sit amet</dd>
<dt>carpe</dt>
<dd>diem</dd>
</dl>

flex-grow - This defines the ability for a flex item to grow if necessary. It accepts a unitless value that serves as a proportion. It dictates what amount of the available space inside the flex container the item should take up.
If all items have flex-grow set to 1, the remaining space in the container will be distributed equally to all children. If one of the children has a value of 2, the remaining space would take up twice as much space as the others (or it will try to, at least). See more here
.parent {
display: flex;
}
.child {
flex-grow: 1; // It accepts a unitless value that serves as a proportion
}
.left {
background: red;
}
.right {
background: green;
}
<div class="parent">
<div class="child left">
Left 50%
</div>
<div class="child right">
Right 50%
</div>
</div>

A slightly different implementation,
Two div panels(content+extra), side by side, content panel expands if extra panel is not present.
jsfiddle: http://jsfiddle.net/qLTMf/1722/

You can use W3's CSS library that contains a class called rest that does just that:
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<div class="w3-row">
<div class="w3-col " style="width:150px">
<p>150px</p>
</div>
<div class="w3-rest w3-green">
<p>w3-rest</p>
</div>
</div>
Don't forget to link the CSS library in the page's header:
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
Here's the official demo: W3 School Tryit Editor

Im not sure if this is the answer you are expecting but, why don't you set the width of Tree to 'auto' and width of 'View' to 100% ?

I wrote a javascript function that I call from jQuery $(document).ready(). This will parse all children of the parent div and only update the right most child.
html
...
<div class="stretch">
<div style="padding-left: 5px; padding-right: 5px; display: inline-block;">Some text
</div>
<div class="underline" style="display: inline-block;">Some other text
</div>
</div>
....
javascript
$(document).ready(function(){
stretchDivs();
});
function stretchDivs() {
// loop thru each <div> that has class='stretch'
$("div.stretch").each(function(){
// get the inner width of this <div> that has class='stretch'
var totalW = parseInt($(this).css("width"));
// loop thru each child node
$(this).children().each(function(){
// subtract the margins, borders and padding
totalW -= (parseInt($(this).css("margin-left"))
+ parseInt($(this).css("border-left-width"))
+ parseInt($(this).css("padding-left"))
+ parseInt($(this).css("margin-right"))
+ parseInt($(this).css("border-right-width"))
+ parseInt($(this).css("padding-right")));
// if this is the last child, we can set its width
if ($(this).is(":last-child")) {
$(this).css("width","" + (totalW - 1 /* fudge factor */) + "px");
} else {
// this is not the last child, so subtract its width too
totalW -= parseInt($(this).css("width"));
}
});
});
}

This is fairly easy using flexbox. See the snippet below. I've added a wrapper container to control flow and set a global height. Borders have been added as well to identify the elements. Notice that divs now expand to the full height as well, as required.
Vendor prefixes should be used for flexbox in a real world scenario since is not yet fully supported.
I've developed a free tool to understand and design layouts using flexbox. Check it out here:
http://algid.com/Flex-Designer
.container{
height:180px;
border:3px solid #00f;
display:flex;
align-items:stretch;
}
div {
display:flex;
border:3px solid #0f0;
}
.second {
display:flex;
flex-grow:1;
border:3px solid #f00;
}
<div class="container">
<div>Tree</div>
<div class="second">View</div>
</div>

.btnCont {
display: table-layout;
width: 500px;
}
.txtCont {
display: table-cell;
width: 70%;
max-width: 80%;
min-width: 20%;
}
.subCont {
display: table-cell;
width: 30%;
max-width: 80%;
min-width: 20%;
}
<div class="btnCont">
<div class="txtCont">
Long text that will auto adjust as it grows. The best part is that the width of the container would not go beyond 500px!
</div>
<div class="subCont">
This column as well as the entire container works like a table. Isn't Amazing!!!
</div>
</div>

.container{
display: flex;
align-items: stretch;
}
.resize_overflow {
position: relative;
width: 0;
overflow: hidden;
white-space: nowrap;
word-wrap: normal;
/* text-overflow: ellipsis; When the end of the line dissolves, the ellipsis loses */
}
.second_fix {
float: right;
/* or:
display: flex;
align-self: end;*/
}
/* Dissolve the end of the line at the right edge */
.resize_overflow::after {
content: ""; /* Empty content */
position: absolute; /* Position relative to parent */
right: 0; /* Element position */
top: 0; /* Element position */
width: 40px; /* Gradient width */
height: 100%; /* Parent Height */
background: -moz-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%);
background: -webkit-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%);
background: -o-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%);
background: -ms-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%);
background: linear-gradient(to right, rgba(255,255,255, 0.2), #ff 100%);
}
<div class="container">
<div class="resize_overflow">Tree</div>
<div class="second_fix">View</div>
</div>

Have a look at the available CSS layout frameworks. I would recommend Simpl or, the slightly more complex, Blueprint framework.
If you are using Simpl (which involves importing just one simpl.css file), you can do this:
<div class="Colum­nOne­Half">Tree</div>
<div class="Colum­nOne­Half">View</div>
, for a 50-50 layout, or :
<div class="Colum­nOne­Quarter">Tree</div>
<div class="Colum­nThreeQuarters">View</div>
, for a 25-75 one.
It's that simple.

If both of the widths are variable length why don't you calculate the width with some scripting or server side?
<div style="width: <=% getTreeWidth() %>">Tree</div>
<div style="width: <=% getViewWidth() %>">View</div>

Adding margin-left to div after another div that has float:left

Sorry for the title, this is hard to explain in one sentence. Basically, I have a div container with two divs: 1 image that is float:left(ed) and another one with text. Here is what it looks like:
<div id="container">
<img src="http://boxedinfinity.com/wp-content/uploads/2013/12/Halo3.jpg" alt="Game Image" id="gameImage">
<div id="second">
<h2>Genre:</h2>
<p>First Person Shooter</p>
</div>
</div>
And here is a fiddle of what I am doing:
http://jsfiddle.net/qMQL5/880/
I want to add padding to the p part of the div with the text. As you see, I added margin-left:50px to #second p but it doesn't do anything. Basically, I want to "indent" the text "First Person Shooter" but I am having trouble doing this. Any ideas?

Update:
This is the result of your actual code now:
So, as you can see it is applying, but you have to know a few things:
img tag is an inline element
The IMG element embeds an image in the current document at the
location of the element's definition. The IMG element has no content;
it is usually replaced inline by the image designated by the src
attribute, the exception being for left or right-aligned images that
are "floated" out of line.
since you are floating the img tag it will start behaving like an inline-block element
Floating an inline or block level element will make the element behave
like an inline-block element (from here).
So, therefore, there is a few solutions to fix this issue:
Solution #1
(a quick fix [as you can see by adding a border to your #container]- I would advise to read the other solutions below)
only using you existing HTML markup and CSS:(which will make both <h1> and <p> indented)
make your img an block element by applying display:block (optional - to fix gap below img tag)
removing margin-left from p and adding margin-right to img
#container {
border:1px solid red
}
#gameImage {
width: 100px;
float: left;
height: auto;
display:block; /*new - optional*/
margin-right:10px /*new*/
}
#second {
background-color: green;
}
<div id="container">
<img src="http://boxedinfinity.com/wp-content/uploads/2013/12/Halo3.jpg" alt="Game Image" id="gameImage" />
<div id="second">
<h2>Genre:</h2>
<p>First Person Shooter</p>
</div>
</div>
Solution #2
Since you are using float already, let's go with clearfix
.clearfix:before,
.clearfix:after {
content: " ";
display: table;
}
.clearfix:after {
clear: both;
}
#container {
background-color: green;
border:1px solid red;
}
#second {
float:left;
/* background-color: green; /*choose what block will have the background*/ }
#gameImage {
width: 100px;
float: left;
height: auto;
}
#second > p {
padding-left: 10px;
box-sizing: border-box;
<div id="container" class="clearfix">
<img src="http://boxedinfinity.com/wp-content/uploads/2013/12/Halo3.jpg" alt="Game Image" id="gameImage" />
<div id="second">
<h2>Genre:</h2>
<p>First Person Shooter</p>
</div>
</div>
Solution #3
dropping the floats and using display:table/table-cell
#container {
display:table;
width:100%;
background-color:green;
border:1px solid red;
}
#container > div {
display:table-cell;
vertical-align:top;
}
#container > div:first-child, #container > div > img {
width:100px
}
#container > div > img {
display:block
}
#container > #second > p {
padding-left:10px
}
<div id="container">
<div>
<img src="http://boxedinfinity.com/wp-content/uploads/2013/12/Halo3.jpg" alt="Game Image" id="gameImage" />
</div>
<div id="second">
<h2>Genre:</h2>
<p>First Person Shooter</p>
</div>
</div>
Solution #4
using inline-block
#container {
width: 100%;
background-color: green;
font-size: 0;/* fix for inline-block elements gaps*/
border:1px solid red;
}
#container > div {
display: inline-block;
vertical-align: top;
font-size: 16px /* fix for inline-block elements gaps*/
}
#container > div:first-child,
#container > div > img {
width: 100px
}
#container > div > img {
display: block
}
#container > #second > p {
padding-left: 10px
}
<div id="container">
<div>
<img src="http://boxedinfinity.com/wp-content/uploads/2013/12/Halo3.jpg" alt="Game Image" id="gameImage" />
</div>
<div id="second">
<h2>Genre:</h2>
<p>First Person Shooter</p>
</div>
</div>
NOTE:
You may want to take a look at some articles regarding floats, here and here

Your margin on #second must be as large as your image (100px) + the padding you want. Try with margin-left: 150px you will see.

Just use the space well with giving width to each element. You can give width as px or in % . You can try this
#second {
background-color: green;
float:left;
width:80%;
}

The non-floating element actually takes the entire width of the frame.
img {
float: left;
opacity: .75;
}
div {
background: aqua;
padding-left: 50px; /*nothing happens visually*/
}
<img src="http://lorempixel.com/150/150" />
<div>Hello</div>
To fix it you could simply set overflow:auto on it.
img {
float: left;
opacity: .75;
}
div {
background: aqua;
overflow: auto;
padding-left: 50px;
}
<img src="http://lorempixel.com/150/150" />
<div>Hello</div>

I'm not exactly sure what you're trying to achieve with the green box, but If you're just looking to keep things as they are, you need to make the <p> element and inline-block element so that it respects the floating <img> element and doesn't just wrap around it.
#second p {
display: inline-block;
margin-left: 10px;
}
http://jsfiddle.net/0za19kcx/

Expand a div to fill the remaining width

I want a two-column div layout, where each one can have variable width e.g.
div {
float: left;
}
.second {
background: #ccc;
}
<div>Tree</div>
<div class="second">View</div>
I want the 'view' div to expand to the whole width available after 'tree' div has filled needed space.
Currently, my 'view' div is resized to content it contains
It will also be good if both divs take up the whole height.
Not duplicate disclaimer:
Expand div to max width when float:left is set
because there the left one has a fixed width.
Help with div - make div fit the remaining width
because I need two columns both aligned to left

The solution to this is actually very easy, but not at all obvious. You have to trigger something called a "block formatting context" (BFC), which interacts with floats in a specific way.
Just take that second div, remove the float, and give it overflow:hidden instead. Any overflow value other than visible makes the block it's set on become a BFC. BFCs don't allow descendant floats to escape them, nor do they allow sibling/ancestor floats to intrude into them. The net effect here is that the floated div will do its thing, then the second div will be an ordinary block, taking up all available width except that occupied by the float.
This should work across all current browsers, though you may have to trigger hasLayout in IE6 and 7. I can't recall.
Demos:
Fixed Left: http://jsfiddle.net/A8zLY/5/
Fixed Right: http://jsfiddle.net/A8zLY/2/
div {
float: left;
}
.second {
background: #ccc;
float: none;
overflow: hidden;
}
<div>Tree</div>
<div class="second">View</div>

I just discovered the magic of flex boxes (display: flex). Try this:
<style>
#box {
display: flex;
}
#b {
flex-grow: 100;
border: 1px solid green;
}
</style>
<div id='box'>
<div id='a'>Tree</div>
<div id='b'>View</div>
</div>
Flex boxes give me the control I've wished css had for 15 years. Its finally here! More info: https://css-tricks.com/snippets/css/a-guide-to-flexbox/

Use the CSS Flexbox flex-grow property to fill the remaining space.
html, body {
height: 100%;
}
body {
display: flex;
}
.second {
flex-grow: 1;
}
<div style="background: #bef;">Tree</div>
<div class="second" style="background: #ff9;">View</div>

This would be a good example of something that's trivial to do with tables and hard (if not impossible, at least in a cross-browser sense) to do with CSS.
If both the columns were fixed width, this would be easy.
If one of the columns was fixed width, this would be slightly harder but entirely doable.
With both columns variable width, IMHO you need to just use a two-column table.

Use calc:
.leftSide {
float: left;
width: 50px;
background-color: green;
}
.rightSide {
float: left;
width: calc(100% - 50px);
background-color: red;
}
<div style="width:200px">
<div class="leftSide">a</div>
<div class="rightSide">b</div>
</div>
The problem with this is that all widths must be explicitly defined, either as a value(px and em work fine), or as a percent of something explicitly defined itself.

Check this solution out
.container {
width: 100%;
height: 200px;
background-color: green;
}
.sidebar {
float: left;
width: 200px;
height: 200px;
background-color: yellow;
}
.content {
background-color: red;
height: 200px;
width: auto;
margin-left: 200px;
}
.item {
width: 25%;
background-color: blue;
float: left;
color: white;
}
.clearfix {
clear: both;
}
<div class="container">
<div class="clearfix"></div>
<div class="sidebar">width: 200px</div>
<div class="content">
<div class="item">25%</div>
<div class="item">25%</div>
<div class="item">25%</div>
<div class="item">25%</div>
</div>
</div>

Here, this might help...
<html>
<head>
<style type="text/css">
div.box {
background: #EEE;
height: 100px;
width: 500px;
}
div.left {
background: #999;
float: left;
height: 100%;
width: auto;
}
div.right {
background: #666;
height: 100%;
}
div.clear {
clear: both;
height: 1px;
overflow: hidden;
font-size: 0pt;
margin-top: -1px;
}
</style>
</head>
<body>
<div class="box">
<div class="left">Tree</div>
<div class="right">View</div>
<div class="clear" />
</div>
</body>
</html>

If the width of the other column is fixed, how about using the calc CSS function working for all common browsers:
width: calc(100% - 20px) /* 20px being the first column's width */
This way the width of the second row will be calculated (i.e. remaining width) and applied responsively.

I don't understand why people are willing to work so hard to find a pure-CSS solution for simple columnar layouts that are SO EASY using the old TABLE tag.
All Browsers still have the table layout logic... Call me a dinosaur perhaps, but I say let it help you.
<table WIDTH=100% border=0 cellspacing=0 cellpadding=2>
<tr>
<td WIDTH="1" NOWRAP bgcolor="#E0E0E0">Tree</td>
<td bgcolor="#F0F0F0">View</td>
</tr>
</table>
Much less risky in terms of cross-browser compatibility too.

<html>
<head>
<style type="text/css">
div.box {
background: #EEE;
height: 100px;
width: 500px;
}
div.left {
background: #999;
float: left;
height: 100%;
width: auto;
}
div.right {
background: #666;
height: 100%;
}
div.clear {
clear: both;
height: 1px;
overflow: hidden;
font-size: 0pt;
margin-top: -1px;
}
</style>
</head>
<body>
<div class="box">
<div class="left">Tree</div>
<div class="right">View</div>
<div class="right">View</div>
<div style="width: <=100% getTreeWidth()100 %>">Tree</div>
<div class="clear" />
</div>
<div class="ColumnWrapper">
<div class="Colum­nOne­Half">Tree</div>
<div class="Colum­nOne­Half">View</div>
</div>
</body>
</html>

You can try CSS Grid Layout.
dl {
display: grid;
grid-template-columns: max-content auto;
}
dt {
grid-column: 1;
}
dd {
grid-column: 2;
margin: 0;
background-color: #ccc;
}
<dl>
<dt>lorem ipsum</dt>
<dd>dolor sit amet</dd>
<dt>carpe</dt>
<dd>diem</dd>
</dl>

flex-grow - This defines the ability for a flex item to grow if necessary. It accepts a unitless value that serves as a proportion. It dictates what amount of the available space inside the flex container the item should take up.
If all items have flex-grow set to 1, the remaining space in the container will be distributed equally to all children. If one of the children has a value of 2, the remaining space would take up twice as much space as the others (or it will try to, at least). See more here
.parent {
display: flex;
}
.child {
flex-grow: 1; // It accepts a unitless value that serves as a proportion
}
.left {
background: red;
}
.right {
background: green;
}
<div class="parent">
<div class="child left">
Left 50%
</div>
<div class="child right">
Right 50%
</div>
</div>

A slightly different implementation,
Two div panels(content+extra), side by side, content panel expands if extra panel is not present.
jsfiddle: http://jsfiddle.net/qLTMf/1722/

You can use W3's CSS library that contains a class called rest that does just that:
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<div class="w3-row">
<div class="w3-col " style="width:150px">
<p>150px</p>
</div>
<div class="w3-rest w3-green">
<p>w3-rest</p>
</div>
</div>
Don't forget to link the CSS library in the page's header:
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
Here's the official demo: W3 School Tryit Editor

Im not sure if this is the answer you are expecting but, why don't you set the width of Tree to 'auto' and width of 'View' to 100% ?

I wrote a javascript function that I call from jQuery $(document).ready(). This will parse all children of the parent div and only update the right most child.
html
...
<div class="stretch">
<div style="padding-left: 5px; padding-right: 5px; display: inline-block;">Some text
</div>
<div class="underline" style="display: inline-block;">Some other text
</div>
</div>
....
javascript
$(document).ready(function(){
stretchDivs();
});
function stretchDivs() {
// loop thru each <div> that has class='stretch'
$("div.stretch").each(function(){
// get the inner width of this <div> that has class='stretch'
var totalW = parseInt($(this).css("width"));
// loop thru each child node
$(this).children().each(function(){
// subtract the margins, borders and padding
totalW -= (parseInt($(this).css("margin-left"))
+ parseInt($(this).css("border-left-width"))
+ parseInt($(this).css("padding-left"))
+ parseInt($(this).css("margin-right"))
+ parseInt($(this).css("border-right-width"))
+ parseInt($(this).css("padding-right")));
// if this is the last child, we can set its width
if ($(this).is(":last-child")) {
$(this).css("width","" + (totalW - 1 /* fudge factor */) + "px");
} else {
// this is not the last child, so subtract its width too
totalW -= parseInt($(this).css("width"));
}
});
});
}

This is fairly easy using flexbox. See the snippet below. I've added a wrapper container to control flow and set a global height. Borders have been added as well to identify the elements. Notice that divs now expand to the full height as well, as required.
Vendor prefixes should be used for flexbox in a real world scenario since is not yet fully supported.
I've developed a free tool to understand and design layouts using flexbox. Check it out here:
http://algid.com/Flex-Designer
.container{
height:180px;
border:3px solid #00f;
display:flex;
align-items:stretch;
}
div {
display:flex;
border:3px solid #0f0;
}
.second {
display:flex;
flex-grow:1;
border:3px solid #f00;
}
<div class="container">
<div>Tree</div>
<div class="second">View</div>
</div>

.btnCont {
display: table-layout;
width: 500px;
}
.txtCont {
display: table-cell;
width: 70%;
max-width: 80%;
min-width: 20%;
}
.subCont {
display: table-cell;
width: 30%;
max-width: 80%;
min-width: 20%;
}
<div class="btnCont">
<div class="txtCont">
Long text that will auto adjust as it grows. The best part is that the width of the container would not go beyond 500px!
</div>
<div class="subCont">
This column as well as the entire container works like a table. Isn't Amazing!!!
</div>
</div>

.container{
display: flex;
align-items: stretch;
}
.resize_overflow {
position: relative;
width: 0;
overflow: hidden;
white-space: nowrap;
word-wrap: normal;
/* text-overflow: ellipsis; When the end of the line dissolves, the ellipsis loses */
}
.second_fix {
float: right;
/* or:
display: flex;
align-self: end;*/
}
/* Dissolve the end of the line at the right edge */
.resize_overflow::after {
content: ""; /* Empty content */
position: absolute; /* Position relative to parent */
right: 0; /* Element position */
top: 0; /* Element position */
width: 40px; /* Gradient width */
height: 100%; /* Parent Height */
background: -moz-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%);
background: -webkit-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%);
background: -o-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%);
background: -ms-linear-gradient(left, rgba(255,255,255, 0.2), #ff 100%);
background: linear-gradient(to right, rgba(255,255,255, 0.2), #ff 100%);
}
<div class="container">
<div class="resize_overflow">Tree</div>
<div class="second_fix">View</div>
</div>

Have a look at the available CSS layout frameworks. I would recommend Simpl or, the slightly more complex, Blueprint framework.
If you are using Simpl (which involves importing just one simpl.css file), you can do this:
<div class="Colum­nOne­Half">Tree</div>
<div class="Colum­nOne­Half">View</div>
, for a 50-50 layout, or :
<div class="Colum­nOne­Quarter">Tree</div>
<div class="Colum­nThreeQuarters">View</div>
, for a 25-75 one.
It's that simple.

If both of the widths are variable length why don't you calculate the width with some scripting or server side?
<div style="width: <=% getTreeWidth() %>">Tree</div>
<div style="width: <=% getViewWidth() %>">View</div>

Centering a div block without the width

I have a problem when I try to center the div block "products" because I don't know in advance the div width. Anybody have a solution?
Update: The problem I have is I don't know how many products I'll display, I can have 1, 2 or 3 products, I can center them if it was a fixed number as I'd know the width of the parent div, I just don't know how to do it when the content is dynamic.
.product_container {
text-align: center;
height: 150px;
}
.products {
height: 140px;
text-align: center;
margin: 0 auto;
clear: ccc both;
}
.price {
margin: 6px 2px;
width: 137px;
color: #666;
font-size: 14pt;
font-style: normal;
border: 1px solid #CCC;
background-color: #EFEFEF;
}
<div class="product_container">
<div class="products" id="products">
<div id="product_15">
<img src="/images/ecommerce/card_default.png">
<div class="price">R$ 0,01</div>
</div>
<div id="product_15">
<img src="/images/ecommerce/card_default.png">
<div class="price">R$ 0,01</div>
</div>
<div id="product_15">
<img src="/images/ecommerce/card_default.png">
<div class="price">R$ 0,01</div>
</div>
</div>
</div>

Update 27 Feb 2015: My original answer keeps getting voted up, but now I normally use #bobince's approach instead.
.child { /* This is the item to center... */
display: inline-block;
}
.parent { /* ...and this is its parent container. */
text-align: center;
}
My original post for historical purposes:
You might want to try this approach.
<div class="product_container">
<div class="outer-center">
<div class="product inner-center">
</div>
</div>
<div class="clear"/>
</div>
Here's the matching style:
.outer-center {
float: right;
right: 50%;
position: relative;
}
.inner-center {
float: right;
right: -50%;
position: relative;
}
.clear {
clear: both;
}
JSFiddle
The idea here is that you contain the content you want to center in two divs, an outer one and an inner one. You float both divs so that their widths automatically shrink to fit your content. Next, you relatively position the outer div with it's right edge in the center of the container. Lastly, you relatively position the inner div the opposite direction by half of its own width (actually the outer div's width, but they are the same). Ultimately that centers the content in whatever container it's in.
You may need that empty div at the end if you depend on your "product" content to size the height for the "product_container".

An element with ‘display: block’ (as div is by default) has a width determined by the width of its container. You can't make a block's width dependent on the width of its contents (shrink-to-fit).
(Except for blocks that are ‘float: left/right’ in CSS 2.1, but that's no use for centering.)
You could set the ‘display’ property to ‘inline-block’ to turn a block into a shrink-to-fit object that can be controlled by its parent's text-align property, but browser support is spotty. You can mostly get away with it by using hacks (eg. see -moz-inline-stack) if you want to go that way.
The other way to go is tables. This can be necessary when you have columns whose width really can't be known in advance. I can't really tell what you're trying to do from the example code — there's nothing obvious in there that would need a shrink-to-fit block — but a list of products could possibly be considered tabular.
[PS. never use ‘pt’ for font sizes on the web. ‘px’ is more reliable if you really need fixed size text, otherwise relative units like ‘%’ are better. And “clear: ccc both” — a typo?]
.center{
text-align:center;
}
.center > div{ /* N.B. child combinators don't work in IE6 or less */
display:inline-block;
}
JSFiddle

Most browsers support the display: table; CSS rule. This is a good trick to center a div in a container without adding extra HTML nor applying constraining styles to the container (like text-align: center; which would center all other inline content in the container), while keeping dynamic width for the contained div:
HTML:
<div class="container">
<div class="centered">This content is centered</div>
</div>
CSS:
.centered { display: table; margin: 0 auto; }
.container {
background-color: green;
}
.centered {
display: table;
margin: 0 auto;
background-color: red;
}
<div class="container">
<div class="centered">This content is centered</div>
</div>
Update (2015-03-09):
The proper way to do this today is actually to use flexbox rules. Browser support is a little bit more restricted (CSS table support vs flexbox support) but this method also allows many other things, and is a dedicated CSS rule for this type of behavior:
HTML:
<div class="container">
<div class="centered">This content is centered</div>
</div>
CSS:
.container {
display: flex;
flex-direction: column; /* put this if you want to stack elements vertically */
}
.centered { margin: 0 auto; }
.container {
display: flex;
flex-direction: column; /* put this if you want to stack elements vertically */
background-color: green;
}
.centered {
margin: 0 auto;
background-color: red;
}
<div class="container">
<div class="centered">This content is centered</div>
</div>

six ways to skin that cat:
Button one: anything of type display: block will assume the full parents width. (unless combined with float or a display: flex parent). True. Bad example.
Button 2: going for display: inline-block will lead to automatic (rather than full) width. You can then center using text-align: center on the wrapping block. Probably the easiest, and most widely compatible, even with ‘vintage’ browsers...
.wrapTwo
text-align: center;
.two
display: inline-block; // instantly shrinks width
Button 3:
No need to put anything on the wrap. So perhaps this is the most elegant solution. Also works vertically. (Browser support for transtlate is good enough (≥IE9) these days...).
position: relative;
display: inline-block; // instantly shrinks width
left: 50%;
transform: translateX(-50%);
Btw: Also a great way for vertically centering blocks of unknown height (in connection with absolute positioning).
Button 4:
Absolute positioning. Just make sure to reserve enough height in the wrapper, since noone else will (neither clearfix nor implicit...)
.four
position absolute
top 0
left 50%
transform translateX(-50%)
.wrapFour
position relative // otherwise, absolute positioning will be relative to page!
height 50px // ensure height
background lightgreen // just a marker
Button 5:
float (which brings also block-level elements to dynamic width) and a relative shift. Although I've never seen this in the wild. Perhaps there are disadvantages...
.wrapFive
&:after // aka 'clearfix'
content ''
display table
clear both
.five
float left
position relative
left 50%
transform translateX(-50%)
Update: Button 6:
And nowadays, you could also use flex-box. Note, that styles apply to the wrapper of the centered object.
.wrapSix
display: flex
justify-content: center
→ full source code (stylus syntax)

I found a more elegant solution, combining "inline-block" to avoid using float and the hacky clear:both. It still requires nested divs tho, which isnt very semantic but it just works...
div.outer{
display:inline-block;
position:relative;
left:50%;
}
div.inner{
position:relative;
left:-50%;
}
Hope it helps!

<div class="outer">
<div class="target">
<div class="filler">
</div>
</div>
</div>
.outer{
width:100%;
height: 100px;
}
.target{
position: absolute;
width: auto;
height: 100px;
left: 50%;
transform: translateX(-50%);
}
.filler{
position:relative;
width:150px;
height:20px;
}
If the target element is absolutely positioned, you can center it by moving it 50% in one direction (left: 50%) and then transforming it 50% in the opposition direction (transform:translateX(-50%)). This works without defining the target element's width (or with width:auto). The parent element's position can be static, absolute, relative, or fixed.

By default, div elements are displayed as block elements, so they have 100% width, making centering them meaningless. As suggested by Arief, you must specify a width and you can then use auto when specifying margin in order to center a div.
Alternatively, you could also force display: inline, but then you'd have something that pretty much behaves like a span instead of a div, so that doesn't make a lot of sense.

This will center an element such as an Ordered List, or Unordered List, or any element.
Just wrap it with a Div with the class of outerElement and give the inner element the class of innerElement.
The outerelement class accounts for IE, old Mozilla, and most newer browsers.
.outerElement {
display: -moz-inline-stack;
display: inline-block;
vertical-align: middle;
zoom: 1;
position: relative;
left: 50%;
}
.innerElement {
position: relative;
left: -50%;
}

use css3 flexbox with justify-content:center;
<div class="row">
<div class="col" style="background:red;">content1</div>
<div class="col" style="">content2</div>
</div>
.row {
display: flex; /* equal height of the children */
height:100px;
border:1px solid red;
width: 400px;
justify-content:center;
}

Slight variation on Mike M. Lin's answer
If you add overflow: auto; ( or hidden ) to div.product_container, then you don't need div.clear.
This is derived from this article -> http://www.quirksmode.org/css/clearing.html
Here is modified HTML:
<div class="product_container">
<div class="outer-center">
<div class="product inner-center">
</div>
</div>
</div>
And here is modified CSS:
.product_container {
overflow: auto;
/* width property only required if you want to support IE6 */
width: 100%;
}
.outer-center {
float: right;
right: 50%;
position: relative;
}
.inner-center {
float: right;
right: -50%;
position: relative;
}
The reason, why it's better without div.clear (apart that it feels wrong to have an empty element) is Firefox'es overzealous margin assignment.
If, for example, you have this html:
<div class="product_container">
<div class="outer-center">
<div class="product inner-center">
</div>
</div>
<div style="clear: both;"></div>
</div>
<p style="margin-top: 11px;">Some text</p>
then, in Firefox (8.0 at the point of writing), you will see 11px margin before product_container. What's worse, is that you will get a vertical scroll bar for the whole page, even if the content fits nicely into the screen dimensions.

Try this new css and markup
Here is modified HTML:
<div class="product_container">
<div class="products" id="products">
<div id="product_15" class="products_box">
<img src="/images/ecommerce/card_default.png">
<div class="price">R$ 0,01</div>
</div>
<div id="product_15" class="products_box">
<img src="/images/ecommerce/card_default.png">
<div class="price">R$ 0,01</div>
</div>
<div id="product_15" class="products_box">
<img src="/images/ecommerce/card_default.png">
<div class="price">R$ 0,01</div>
</div>
</div>
And here is modified CSS:
<pre>
.product_container
{
text-align: center;
height: 150px;
}
.products {
left: 50%;
height:35px;
float:left;
position: relative;
margin: 0 auto;
width:auto;
}
.products .products_box
{
width:auto;
height:auto;
float:left;
right: 50%;
position: relative;
}
.price {
margin: 6px 2px;
width: 137px;
color: #666;
font-size: 14pt;
font-style: normal;
border: 1px solid #CCC;
background-color: #EFEFEF;
}

<div class="product_container">
<div class="outer-center">
<div class="product inner-center">
</div>
</div>
<div class="clear"></div>
</div>
.outer-center
{
float: right;
right: 50%;
position: relative;
}
.inner-center
{
float: right;
right: -50%;
position: relative;
}
.clear
{
clear: both;
}
.product_container
{
overflow:hidden;
}
If you dont provide "overflow:hidden" for ".product_container" the "outer-center" div will overlap other nearby contents to the right of it. Any links or buttons to the right of "outer-center" wont work. Try background color for "outer-center" to understand the need of "overflow :hidden"

I found interesting solution, I was making slider and had to center slide controls and I did this and works fine. You can also add relative position to parent and move child position vertical. Take a look http://jsfiddle.net/bergb/6DvJz/
CSS:
#parent{
width:600px;
height:400px;
background:#ffcc00;
text-align:center;
}
#child{
display:inline-block;
margin:0 auto;
background:#fff;
}
HTML:
<div id="parent">
<div id="child">voila</div>
</div>

Do display:table; and set margin to auto
Important bit of code:
.relatedProducts {
display: table;
margin-left: auto;
margin-right: auto;
}
No matter how many elements you got now it will auto align in center
Example in code snippet:
.relatedProducts {
display: table;
margin-left: auto;
margin-right: auto;
}
a {
text-decoration:none;
}
<div class="row relatedProducts">
<div class="homeContentTitle" style="margin: 100px auto 35px; width: 250px">Similar Products</div>
test1
test2
test3
</div>

I'm afraid the only way to do this without explicitly specifying the width is to use (gasp) tables.

Crappy fix, but it does work...
CSS:
#mainContent {
position:absolute;
width:600px;
background:#FFFF99;
}
#sidebar {
float:left;
margin-left:610px;
max-width:300;
background:#FFCCCC;
}
#sidebar{
text-align:center;
}
HTML:
<center>
<table border="0" cellspacing="0">
<tr>
<td>
<div id="mainContent">
1<br/>
<br/>
123<br/>
123<br/>
123<br/>
</div><div id="sidebar"><br/>
</div></td>
</tr>
</table>
</center>

Simple fix that works in old browsers (but does use tables, and requires a height to be set):
<div style="width:100%;height:40px;position:absolute;top:50%;margin-top:-20px;">
<table style="width:100%"><tr><td align="center">
In the middle
</td></tr></table>
</div>

<style type="text/css">
.container_box{
text-align:center
}
.content{
padding:10px;
background:#ff0000;
color:#ffffff;
}
use span istead of the inner divs
<div class="container_box">
<span class="content">Hello</span>
</div>

I know this question is old, but I'm taking a crack at it. Very similar to bobince's answer but with working code example.
Make each product an inline-block. Center the contents of the container. Done.
http://jsfiddle.net/rgbk/6Z2Re/
<style>
.products{
text-align:center;
}
.product{
display:inline-block;
text-align:left;
background-image: url('http://www.color.co.uk/wp-content/uploads/2013/11/New_Product.jpg');
background-size:25px;
padding-left:25px;
background-position:0 50%;
background-repeat:no-repeat;
}
.price {
margin: 6px 2px;
width: 137px;
color: #666;
font-size: 14pt;
font-style: normal;
border: 1px solid #CCC;
background-color: #EFEFEF;
}
</style>
<div class="products">
<div class="product">
<div class="price">R$ 0,01</div>
</div>
<div class="product">
<div class="price">R$ 0,01</div>
</div>
<div class="product">
<div class="price">R$ 0,01</div>
</div>
<div class="product">
<div class="price">R$ 0,01</div>
</div>
<div class="product">
<div class="price">R$ 0,01</div>
</div>
<div class="product">
<div class="price">R$ 0,01</div>
</div>
</div>
See also: Center inline-blocks with dynamic width in CSS

This is one way to center anything within a div not know the inner width of the elements.
#product_15{
position: relative;
margin: 0 auto;
display: table;
}
.price, img{
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}

my solution was:
.parent {
display: flex;
flex-wrap: wrap;
}
.product {
width: 240px;
margin-left: auto;
height: 127px;
margin-right: auto;
}

add this css to your product_container class
margin: 0px auto;
padding: 0px;
border:0;
width: 700px;