I'm following some tutorials on beginner's HTML and CSS. Im trying to center an image in a div, but when I shrink the window's width to a certain pixel, the image has less and less margin on the right. Here is the picture I took to demonstrate: https://imgur.com/Ihz0OeY. Here are the css codes:
.bg-image {
background-image: url("res/img/testbackground.jpg");
filter: blur(8px);
-webkit-filter: blur(8px);
width: 100%;
height: calc(100vh - 56px);
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}
bg-text {
background-color: rgb(0,0,0);
background-color: rgba(0,0,0, 0.4);
color: white;
position: relative;
left:50%;
top:50%;
font-weight: bold;
transform: translate(-50%, -150%);
border: 3px solid #f1f1f1;
width: 80%;
padding: 20px;
text-align: center;
}
.bg-text img {
width:200px;
display: block;
margin-left: auto;
margin-right: auto;
}
I use position: relative because if I use absolute, the text wont be pushed down when the navbar expands. The HTML codes are nothing special, the nav bar I took from Bootstrap.
<div class="bg-image"></div>
<div class="bg-text">
<img id ="1" src="res/img/dog.png" alt="">
<h1>12345</h1>
<p>ABCDEF</p>
</div>
Can you guys help me? Thank you so much.
The problem is just that your img element is bigger than the screen size at a center width. Use a fluid width to solve this:
.bg-text img {
width:90%;
display: block;
margin: 0 auto;
}
A block level element always justifies left by default, which means if you don't tell the element to be contained within the window using a percentage-based width, the element will maintain its static width (in this case, 200px) even when the window shrinks beyond that number. Thus, the margin appears to shrink on the right. If you're using pixel-based widths, it's always best to declare it as a max-width, and define a percentage-based width as a fallback, like so:
.bg-text img {
width:100%;
max-width:200px;
display: block;
margin: 0 auto;
}
This means the element will be 200px wide and centered as long as the parent element is wider than 200px. If the parent element's width becomes less than 200px, the element will automatically become 100% of its parent's width.
You want this?
https://imgur.com/qkJP8pg
https://www.w3schools.com/code/tryit.asp?filename=G5P5BKV1XGGL
.bg-text img {
position: absolute;
left: 0;
right: 0;
top:0;
bottom:0;
margin: auto;
width:90%;
}
In HTML:
<img src="..." class="mx-auto d-block">
or in CSS:
.bg-text img{
margin: auto;
display-block;
}
I have to complete a combobox to choose the time.
As you can see, the context "from" is not alined to the combobox.
The HTML code for the two dives are:
<div id="fromMessage" style="width:30px;height:100%;float:left;padding-left: 50px;vertical-align:central">
<oj-label for="Time" style="font-size: 15px">From:</oj-label>
</div>
<div id="seelctTime" style="width:300px;height:100%;float:left;padding-left: 50px">
<oj-input-date-time id="Time" value='{{time}}' on-value-changed="{{timeChanged}}">
</oj-input-date-time>
</div>
Why vertical-align:central does not work?
You can also use:
#idMessage
{
position: absolute;
top: 50%
}
in a separate .css file.
top doesn't have to be 50%, just play with percentage til you've got it where you want it
Try this:
#fromMessage,
#selectTime {
display: inline-block;
vertical-align: middle;
float: none;
}
The vertical-align method will only work if you use it in a table or when the element is an inline-block element, but whichever method you use the parent's height need to be specified in order for it to work.
The only method which doesn't require height would be using flexbox.
There are few ways that you could vertically center element, below is one of the method.
The key things to vertically center are:
fix height
absolute positioning
margin auto
0 top value
0 bottom value
Example:
#fromMessage{
width: 30px;
float: left;
padding-left: 50px;
height: 30px; /*fix height*/
position: absolute;
margin: auto;
top: 0;
bottom: 0;
}
#fromMessage, #selectTime {
width:30px;
height:100%;
float:left;
padding-left: 50px;
vertical-align:middle;
}
Hi!
This seems like a stupidly simple question, but I cannot seem to horizontally center the header DIV.
http://jsfiddle.net/1ucwafx6/
as you can see, the light blue rounded square is almost centered, but not quite. I've tried on multiple systems, browsers, and screen resolutions and the outcome is always the same. It is slightly further to the right. I really don't understand what is wrong here. I have also tried margin: 0 auto; however then it just doesn't do anything and just stays on the very left hand side.
It's due to the default margin on the body. Just set
body { margin:0; }
and you'll see the fix.
This should help you center it, assuming you want the position to stay fixed with your current HTML markup.
JS FIDDLE
#header {
position: fixed;
width: 90%;
background-color: #3498db;
left: 50%;
transform: translate(-50%, 0);
margin-top: 25px;
border-radius: 10px;
}
I removed the position fixed and set left and right margins to auto and it centers just fine.
http://jsfiddle.net/1ucwafx6/3/
CSS:
#header {
/* position: fixed; */
width: 90%;
background-color: #3498db;
margin-left:auto;
margin-right: auto;
margin-top: 25px;
border-radius: 10px;
}
Just add
#header {
left:0;
}
http://jsfiddle.net/1ucwafx6/4/
I try to center a div element ( the footer div in this case ) in my webpage but it insists on staying on the left side.
I am not quite sure what is wrong... Any ideas?
Thank you in advance.
HTML :
<div id='main'>
</div>
<div id='footer'>Centered Text</div>
CSS :
* {
padding: 0;
margin: 0;
font-size: 12px;
}
body {
font-family: helvetica, serif;
font-size: 12px;
overflow-y:scroll;
}
#main {
border: 1px solid #bbbbbb;
margin: 3% 5%;
padding: 10px 10px;
}
#footer {
font-size: 75%;
margin: 0px auto;
position: absolute;
bottom: 0px;
}
http://jsfiddle.net/DjPjj/2/
http://jsfiddle.net/DjPjj/13/
Try this:
#footer {
font-size: 75%;
width: 100%;
position: absolute;
bottom: 0px;
text-align: center;
}
Because your footer is absolutely positioned, you must tell it what width to take relative to its parent container. You can then use text-align to center the text within it.
Here is another example: http://jsfiddle.net/DjPjj/17/
This one centers a box within the absolutely positioned element. The inner box can be centered using margin: 0 auto because it is not absolutely positioned.
#footer {
font-size: 75%;
width: 100%;
position: absolute;
bottom: 0px;
}
#footerInner {
margin: 0 auto;
width: 300px;
background-color: #ddd;
text-align: center;
}
This is more flexible because the inner element gives you a new container to work with that is centered relative to the parent.
The reason it won't center is because of the positon: absolute;.
Keep in mind this means that the footer will always be at the bottom of the page, even if the content overflows past it. It will overlap. If you want to have it be attached to the bottom of the page, you must set the min-height of a container above it to 100% and then deal with a negative margin-top and remove the position: abosolute;
http://jsfiddle.net/4fuk7/1/
Notice how the centered text is overwritten.
If you are looking for something to always be at the bottom, this would work
http://jsfiddle.net/4fuk7/3/
Sorry, the last one would scroll to the top. This one doesn't, but you'd need to fiddle with it a bit to get it to properly align around the margin's you've set. http://jsfiddle.net/4fuk7/9/
http://www.tlunter.com/Layout 2/ is where I did something similar. You can reference that if you want.
I'm having a problem centering an element that has the attribute position set to absolute.
Does anyone know why the images are not centered?
body {
text-align: center;
}
#slideshowWrapper {
margin-top: 50px;
text-align: center;
}
ul#slideshow {
list-style: none;
position: relative;
margin: auto;
}
ul#slideshow li {
position: absolute;
}
ul#slideshow li img {
border: 1px solid #ccc;
padding: 4px;
height: 450px;
}
<body>
<div id="slideshowWrapper">
<ul id="slideshow">
<li><img src="https://source.unsplash.com/random/300*300?technology" alt="Dummy 1" /></li>
<li><img src="https://source.unsplash.com/random/301*301?technology" alt="Dummy 2" /></li>
</ul>
</div>
</body>
If you have set a width you may use:
position: absolute;
margin-left: auto;
margin-right: auto;
left: 0;
right: 0;
text-align: center;
Without knowing the width/height of the positioned1 element, it is still possible to align it as follows:
EXAMPLE HERE
.child {
position: absolute;
top: 50%; /* position the top edge of the element at the middle of the parent */
left: 50%; /* position the left edge of the element at the middle of the parent */
transform: translate(-50%, -50%); /* This is a shorthand of
translateX(-50%) and translateY(-50%) */
}
It's worth noting that CSS Transform is supported in IE9 and above. (Vendor prefixes omitted for brevity)
Explanation
Adding top/left of 50% moves the top/left margin edge of the element to the middle of the parent, and translate() function with the (negative) value of -50% moves the element by the half of its size. Hence the element will be positioned at the middle.
This is because a percentage value on top/left properties is relative to the height/width of the parent element (which is creating a containing block).
While a percentage value on translate() transform function is relative to width/height of the element itself (Actually it refers to the size of bounding box).
For unidirectional alignment, go with translateX(-50%) or translateY(-50%) instead.
1. An element with a position other than static. I.e. relative, absolute, fixed values.
Centering something absolutely positioned is rather convoluted in CSS.
ul#slideshow li {
position: absolute;
left:50%;
margin-left:-20px;
}
Change margin-left to (negative) half the width of the element you are trying to center.
Div vertically and horizontally aligned center
top: 0;
bottom: 0;
margin: auto;
position: absolute;
left: 0;
right: 0;
Note : Elements should have width and height to be set
If you want to center an absolute element
#div {
position:absolute;
top:0;
bottom:0;
left:0;
right:0;
width:300px; /* Assign a value */
height:500px; /* Assign a value */
margin:auto;
}
If you want a container to be centered left to right, but not with top to bottom
#div {
position:absolute;
left:0;
right:0;
width:300px; /* Assign a value */
height:500px; /* Assign a value */
margin:auto;
}
If you want a container to be centered top to bottom, regardless of being left to right
#div {
position:absolute;
top:0;
bottom:0;
width:300px; /* Assign a value */
height:500px; /* Assign a value */
margin:auto;
}
Update as of December 15, 2015
Well I learnt this another new trick few months ago. Assuming that you have a relative parent element.
Here goes your absolute element.
.absolute-element {
position:absolute;
top:50%;
left:50%;
transform:translate(-50%, -50%);
width:50%; /* You can specify ANY width values here */
}
With this, I think it's a better answer than my old solution. Since you don't have to specify width AND height. This one it adapts the content of the element itself.
Update as of April 23, 2021
It does not answer to OP's question about position absolute, but if you want alternative solution, there's this called flexbox. Here's an example.
#parent {
display:flex;
align-items:center;
justify-content:center;
}
What it does is the container is converted to flex and to align child items to center on horizontal is by using justify-content:center and vertical is to use align-items:center. It does support modern browsers too, so it's safe to use.
Though, be sure to read how flexbox work first.
https://developer.mozilla.org/en-US/docs/Learn/CSS/CSS_layout/Flexbox
Flexbox supported browsers
https://caniuse.com/flexbox
A simple CSS trick, just add:
width: 100%;
text-align: center;
This works on both images and text.
This worked for me:
position: absolute;
left: 50%;
transform: translateX(-50%);
To center a “position: absolute” element.
.your-element {
position: absolute;
left: 0;
right: 0;
text-align: center; // or this -> margin: 0 auto;
}
to center a a position:absolute attribute you need to set left:50% and margin-left: -50% of the width of the div.
<!-- for horizontal -->
<style>
div.center{
width:200px;
left:50%;
margin-left:-100px;
position:absolute;
}
</style>
<body>
<div class='center'>
should be centered horizontaly
</div>
</body>
for vertical center absolute you need to do the same thing bud not with left just with top.
( NOTE: html and body must have min-height 100%; )
<!-- for vertical -->
<style>
body,html{
min-height:100%;
}
div.center{
height:200px;
top:50%;
margin-top:-100px;
position:absolute;
}
</style>
<body>
<div class='center'>
should be centered verticaly
</div>
</body>
and can be combined for both
<!-- for both -->
<style>
body,html{
min-height:100%;
}
div.center{
width:200px;
height:50px
left:50%;
top:50%;
margin-left:-100px;
margin-top:-25px;
position:absolute;
}
</style>
<body>
<div class='center'>
should be centered
</div>
</body>
Or you can now use flex box with postion absolute:
.parent {
position: relative;
display: flex;
justify-content: center;
}
.child {
position: absolute;
}
<div class="centered_content"> content </div>
<style type="text/css">
.centered_content {
text-align: center;
position: absolute;
left: 0;
right: 0;
}
</style>
see demo on: http://jsfiddle.net/MohammadDayeh/HrZLC/
text-align: center; works with a position: absolute element when adding left: 0; right: 0;
You can use the "transform" attribute:
position: absolute;
top: 50%;
left: 50%;
-webkit-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);
The simpler, the best:
img {
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto auto;
position: absolute;
}
Then you need to insert your img tag into a tag that sports position:relative property, as follows:
<div style="width:256px; height: 256px; position:relative;">
<img src="photo.jpg"/>
</div>
If you don't know the width of the element you can use this code:
<body>
<div style="position: absolute; left: 50%;">
<div style="position: relative; left: -50%; border: dotted red 1px;">
I am some centered shrink-to-fit content! <br />
tum te tum
</div>
</div>
Demo at fiddle: http://jsfiddle.net/wrh7a21r/
Source: https://stackoverflow.com/a/1777282/1136132
probably the shortest
position:absolute;
left:0;right:0;top:0;bottom:0;
margin:0 auto;
as many others said this ⬇️
.element {
position: absolute;
left: 0;
top: 0;
transform: translate(-50%, -50%);
}
should work. But be aware, that the .element must be in a wrapper that has position: relative; (in case you don't want to make it in the center of the whole HTML page)
FYI: I've made a pseudo-library for CSS centering. I needed it for my dev juniors. So, feel free to check it out. http://dev.solcode.net/centercss/
Using
left: calc(50% - Wpx/2); where W is the width of the element works for me.
I'm not sure what you want to accomplish, but in this case just adding width: 100%; to your ul#slideshow li will do the trick.
Explanation
The img tags are inline-block elements. This means that they flow inline like text, but also have a width and height like block elements. In your css there are two text-align: center; rules applied to the <body> and to the #slideshowWrapper (which is redundant btw) this makes all inline and inline-block child elements to be centered in their closest block elements, in your code these are li tags. All block elements have width: 100% if they are the static flow (position: static;), which is default. The problem is that when you tell li tags to be position: absolute;, you take them out of normal static flow, and this causes them to shrink their size to just fit their inner content, in other words they kind of "lose" their width: 100% property.
Your images are not centered because your list items are not centered; only their text is centered. You can achieve the positioning you want by either centering the entire list or centering the images within the list.
A revised version of your code can be found at the bottom. In my revision I center both the list and the images within it.
The truth is you cannot center an element that has a position set to absolute.
But this behavior can be imitated!
Note: These instructions will work with any DOM block element, not just img.
Surround your image with a div or other tag (in your case a li).
<div class="absolute-div">
<img alt="my-image" src="#">
</div>
Note: The names given to these elements are not special.
Alter your css or scss to give the div absolute positioning and your image centered.
.absolute-div {
position: absolute;
width: 100%;
// Range to be centered over.
// If this element's parent is the body then 100% = the window's width
// Note: You can apply additional top/bottom and left/right attributes
// i.e. - top: 200px; left: 200px;
// Test for desired positioning.
}
.absolute-div img {
width: 500px;
// Note: Setting a width is crucial for margin: auto to work.
margin: 0 auto;
}
And there you have it! Your img should be centered!
Your code:
Try this out:
body
{
text-align : center;
}
#slideshow
{
list-style : none;
width : 800px;
// alter to taste
margin : 50px auto 0;
}
#slideshow li
{
position : absolute;
}
#slideshow img
{
border : 1px solid #CCC;
padding : 4px;
height : 500px;
width : auto;
// This sets the width relative to your set height.
// Setting a width is required for the margin auto attribute below.
margin : 0 auto;
}
<ul id="slideshow">
<li><img src="http://lorempixel.com/500/500/nature/" alt="Dummy 1" /></li>
<li><img src="http://lorempixel.com/500/500/nature/" alt="Dummy 2" /></li>
</ul>
I hope this was helpful. Good luck!
An absolute object inside a relative object is relative to its parent, the problem here is that you need a static width for the container #slideshowWrapper , and the rest of the solution is like the other users says
body {
text-align: center;
}
#slideshowWrapper {
margin-top: 50px;
text-align:center;
width: 500px;
}
ul#slideshow {
list-style: none;
position: relative;
margin: auto;
}
ul#slideshow li {
position: relative;
left: 50%;
}
ul#slideshow li img {
border: 1px solid #ccc;
padding: 4px;
height: 450px;
}
http://jsfiddle.net/ejRTU/10/
Here is easy and best solution for center element with “position: absolute”
body,html{
min-height:100%;
}
div.center{
width:200px;
left:50%;
margin-left:-100px;/*this is 50% value for width of the element*/
position:absolute;
background:#ddd;
border:1px solid #999;
height:100px;
text-align:center
}
<style>
</style>
<body>
<div class='center'>
should be centered verticaly
</div>
</body>
Just use display: flex and justify-content: center on the parent element
body {
text-align: center;
}
#slideshowWrapper {
margin-top: 50px;
text-align: center;
}
ul#slideshow {
list-style: none;
position: relative;
margin: auto;
display: flex;
justify-content: center;
}
ul#slideshow li {
position: absolute;
}
ul#slideshow li img {
border: 1px solid #ccc;
padding: 4px;
height: 100px;
}
<body>
<div id="slideshowWrapper">
<ul id="slideshow">
<li><img src="https://source.unsplash.com/random/300*300?technology" alt="Dummy 1" /></li>
<li><img src="https://source.unsplash.com/random/301*301?technology" alt="Dummy 2" /></li>
</ul>
</div>
</body>
<!-- Images from Unsplash-->
You can find this solution in JSFIDDLE
You can try this way :
* { margin: 0px; padding: 0px; }
#body { height: 100vh; width: 100vw; position: relative;
text-align: center;
background-image: url('https://s-media-cache-ak0.pinimg.com/originals/96/2d/ff/962dff2247ad680c542622e20f44a645.jpg');
background-size: cover; background-repeat: no-repeat; }
.text { position: absolute; top: 0; bottom: 0; left: 0; right: 0; height:100px;
display: inline-block; margin: auto; z-index: 999999; }
<html>
<body>
<div id="body" class="container-fluid">
<!--Background-->
<!--Text-->
<div class="text">
<p>Random</p>
</div>
</div>
</body>
</html>
1- when you know the width of the absolutely positioned element.
width: 200px;
position: absolute;
left: 50%;
margin-left: -100px
2- when you don’t know the width of the absolutely positioned element. Excellent for responsiveness but is CSS3 older browsers may have an issue.
position: absolute;
left: 50%;
-webkit-transform: translateX(-50%);
transform: translateX(-50%)
3- when you don’t know the width of the absolutely positioned element but makes it 100% wide of it’s parent which might not fit the design.
position: absolute;
left: 0;
right: 0;
margin: auto
If you do know the width, you can use the third option as well and it will center.
My favorite method to absolute center any element or group of elements is to absolute position their container, make it the height and width of the relative container, then use flex to align the elements within.
In this specific case:
body {
position: relative; /* OPTIONAL */
}
#slideshowWrapper {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: flex;
flex-direction: row; /* OPTIONAL IF ONLY ONE ELEMENT */
justify-content: center;
align-items: center;
}
Hope that helps, cheers.
For this case, I think the code as below is enough:
ul#slideshow li {
position: absolute;
left: 0;
right: 0;
}
#parent
{
position : relative;
height: 0;
overflow: hidden;
padding-bottom: 56.25% /* images with aspect ratio: 16:9 */
}
img
{
height: auto!important;
width: auto!important;
min-height: 100%;
min-width: 100%;
position: absolute;
display: block;
/* */
top: -9999px;
bottom: -9999px;
left: -9999px;
right: -9999px;
margin: auto;
}
I don't remember where I saw the centering method listed above, using negative top, right, bottom, left values.
For me, this tehnique is the best, in most situations.
When I use the combination from above, the image behaves like a background-image with the following settings:
background-position: 50% 50%;
background-repeat: no-repeat;
background-size: cover;
More details about the first example can be found here:
Maintain the aspect ratio of a div with CSS
Position absolute takes it out of the flow, and places it at 0x0 to the parent ( Last block element to have a position absolute or position relative ).
I'm not sure what exactly you what you are trying to accomplish, It might be best to set the li to a position:relative and that will center them. Given your current CSS
Check out http://jsfiddle.net/rtgibbons/ejRTU/ to play with it
What seems to be happening is there are two solutions; centered using margins and centered using position. Both work fine, but if you want to absolute position an element relative to this centered element, you need to use the absolute position method, because the absolute position of the second element defaults to the first parent that is positioned. Like so:
<!-- CENTERED USING MARGIN -->
<div style="width:300px; height:100px; border: 1px solid #000; margin:20px auto; text- align:center;">
<p style="line-height:4;">width: 300 px; margin: 0 auto</p>
<div style="position:absolute; width:100px; height:100px; background-color:#ff0000; top:-20px; left:0px;">
<p style="line-height:4;">Absolute</p>
</div>
</div>
<!-- CENTERED USING POSITION -->
<div style="position:absolute; left:50%; width:300px; height:100px; border: 1px solid #000; margin:20px 0 20px -150px; text-align:center;">
<p style="line-height:2;">width:300px; position: absolute; left: 50%; margin-left:-150px;</p>
<div style="position:absolute; width:100px; height:100px; background-color:#ff0000; top:0px; left:-105px;">
<p style="line-height:4;">Absolute</p>
</div>
</div>
Until I'd read this posting, using the margin:0 auto technique, to build a menu to the left of my content I had to build a same-width column to the right to balance it out. Not pretty. Thanks!
Use margin-left: x%; where x is the half of the width of the element.