I'd like to put an image as the background of a webpage but have it offset by some number of pixels with respect to the center.
How can I do this?
I want:
background-image: url("bg.png");
background-position: 25% center;
background-attachment: fixed;
background-repeat: no-repeat;
but instead of 25%, I want something along the lines of "center - 50px". Is there any solution to this?
I believe I have a solution that achieves what you're wanting:
A background image (specifically a page background) offset by a number of pixels with respect to the center.
This works using only HTML & CSS - no javascript required.
Update
This can now be easily achieved using background-position and calc as a CSS unit.
The following CSS will achieve the same outcome as the previous solution (see "Original Solution" below):
#background-container {
width: 100%;
background-image: url("background-image.png");
background-position: calc(50% - 50px) 50%;
background-repeat: no-repeat;
}
Note: Don't use this method if you require support for legacy versions of IE.
Original Solution
#background-container {
width: 100%;
left: -100px; /* this must be TWICE the required offset distance*/
padding-right: 100px; /* must be the same amount as above */
background-image: url("background-image.png");
background-position: center;
background-repeat: no-repeat;
}
What this does is moves the entire container horizontally by the amount specified (in this case to the left 100px). Because the background image is centered relative to the container it moves to the left with the container.
The padding fixes the 100px of blank space that would appear to the right of the container as a result of the move. Background images show through padding). Because browsers use the border-box value instead of the default content-box value to calculate background sizing and positioning, the background image is effectively moved back to the right 50px - half the distance of the padding. (Thanks to ErikE for clarification).
So your offset/padding must be twice the required offset distance.
I have prepared a sample page for you here:
http://www.indieweb.co.nz/testing/background-offset-center.html
Have a play with resizing the window. You will see that the purple and blue background image (laid over a deeper background image marking the center of the page) remains exactly 50px (half the offset/padding distance) to the left of the page center.
Using background-position: center; is the same as background-position: 50% 50%;.
So you can use calc to do some simple math in CSS as a replacement for any length value, for example:
background-position: calc(50% - 50px) 50%;
Will center the background image, but shift it 50 pixels to the left.
So you want it centered by shifted 50 pixels to left. I would add the 50 pixels to the image in the form of a transparent space, unless you are dealing with absolute dimensions.
There's no obvious CSS answer. You would either need to use JavaScript to calculate values or do something tricky. You can try keeping the background-position:25% center and adding position:relative;left:-50px or margin-left:-50px but those might not work depending on how you are using the DOM element.
The only method I've found for this is to have the background inside another div, then use javascript to reposition ...
<style>
body {
width: 100%;
overflow: hidden;
}
#bg {
position: absolute;
background: url(images/background.jpg) center top;
}
</style>
<script>
function recenter(){
var $pos = $('#content').offset().left;
$('#bg').css('left',$pos-580);
}
recenter();
$(window).resize(function(){ recenter(); });
</script>
<body>
<div id="bg"></div>
<div id="content">
blah
</div>
</body>
if you know the width of the image you can use this:
background-position: (BgWidth - 50)px 0px;
Note that you can't have it like that, i.e. you need to calculate (BgWidth - 50) and then write the number there.
If you don't know the width you can use Javascript(with-or-without jQuery) and then use this:
$(#ID).css('background-position', (BgWidth - 50)+'px 0px');
Nice answer Luke,
one more thing, if your block width is larger than screen resolution, your must put your block in another container and do this:
#container{
position:relative;
overflow:hidden;
}
#shadowBox{
width: 100%;
left: -100px; /* this must be TWICE the required offset distance*/
padding-right: 100px; /* must be the same amount as above */
background-image: url("background-image.png");
background-position: center;
background-repeat: no-repeat;
position:absolute: /*this is needed*/
}
My answer gotta be too late but somehow I've found another solution.
padding-left: 100px; /* offset you need */
padding-right: 100%;
or
padding-right: 100px;
padding-left: 100%;
The examples have the same effect.
Related
I am using CSS3 background-position to position a background image 3% from the right edge of the container. However it appears in a different position compared to if i have an equivalent container that is 97% wide with the background image right aligned. You can see what i mean at http://jsfiddle.net/deshg/9qveqdcu/2/, the logo in the black row is further to the right than the one in the green row but surely they should be in the same horizontal position?
If anyone could shed some light on why this is happening it would be massively appreciated.
For reference, code is below.
Thanks all!
#container {
width: 100%;
background-color: #ffcc00;
}
#d1 {
background-color: #cccc00;
background-image: url('http://jsfiddle.net/img/logo.png');
background-position: right 3% center;
background-repeat: no-repeat;
width: 100%;
}
#d2 {
background-color: #000000;
color: #ffffff;
background-image: url('http://jsfiddle.net/img/logo.png');
background-position: right center;
background-repeat: no-repeat;
width: 97%;
margin-right: 3%;
}
<div id="container">
<div id="d1">
abvc
</div>
<div id="d2">
def
</div>
</div>
The background image itself is being offset 3% of it's own width
From the docs:
Percentages refer to the size of the background positioning area minus
size of background image; size refers to the width for horizontal
offsets and to the height for vertical offsets
Here's an illustration when using 25% 25% (from CSS Tricks):
Background position is not working as you thinking.
It's different than if you, say, had an and positioned it at left: 50%; in that scenario, the left edge of the image would be at the halfway point. If you want to center it, you'll need to pull it back to the left (negative translate or negative margin)
For better understanding refer Link And Link
For what you trying to achieve you have to set
background-position: 96% 0px, center center;
Fiddle
I have a page that displays a map with some pins placed on places of interest. Markup and style as follows:
HTML:
<div class="map">
<div class="pins">
Pin #1
...
Pin #12
</div>
CSS:
.map {
width: 100%;
height: 100%;
position: relative;
background: transparent url([image]) no-repeat 50% 50%;
background-size: cover;
}
.pins {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
{
.pins > a {
width: 20px;
height: 31px;
position: absolute;
}
My question is: how can I keep my pins, which are absolutely positioned to specific locations on the map, aligned correctly with the map? I've tried using percentage values for the pin positions but because the map is always centered, the alignments go off as soon as the map starts getting cropped at the sides.
I realise I can implement a JS fix, but I'm wondering if there's a pure HTML/CSS solution to this.
Thanks.
I like your question!
So what background-size cover does is keeping the perspective of the image.
This way you don't know how the displayed dimensions of the image are.
Execpt you knew the ratio in the first place.
I did some experimenting, with the fluid-video-padding-bottom "hack".
So imagine a 16/9 map.
All you need is a container that lays exact on top of the image (or it could be the very same container as in my example) and behaves the same as background-size cover. Achieved using padding-bottom trick.
The only thing left to do is resize the pins accordingly. (I used viewport based units)
My example.
padding-bottom: 56.25%; /* 16:9 */
Instead of using the padding bottom trick, you could use object-fit positioning. Which is not well supported yet.
I am trying to add an image "logo.png" to the background of my page in the top right positioning. I am using css to do this and nothing else... here is what i have:
body {
background-image: url('logo.png');
background-repeat: no-repeat;
background-attachment: fixed;
background-position: right top;
background-color: #E6E6E6;
font-family: Arial;
font-size: medium;
}
I'm not sure what I am doing wrong, because no image is appearing
Check the file path where logo.png is located. Is it in the same level as your webpage?
here is a fiddle http://jsfiddle.net/z7d8kcLz/ that works. I really dont see any problem with your code
only change in your code is the link to dummy logo image
body {
background-image: url('http://www.hessionphysicaltherapy.ie/wp-content/uploads/2010/11/dummy-logo1.jpg');
background-repeat: no-repeat;
background-attachment: fixed;
background-position: right top;
background-color: #E6E6E6;
font-family: Arial;
font-size: medium;
}
Make a separate div for the logo, then experiment. Technically you should figure it out via trial and error. Load your page on google chrom, right click>inspect element and you will have a console like bar where you will have the srouce code. On your left find the div you are using and add various elements to it.
Try this:
Put your logo inside a DIV and put it right before the closing body tag.
.logo-div {
Width: 150px; /* Adjust as needed */
height: 150px; /* Adjust as needed */
position: fixed;
right: 0; /* Adjust as needed */
top: 0; /* Adjust as needed */
z-index: 1; /* Adjust as needed */
}
Evan, with CSS you need to create building blocks. In much the way you would draw on a piece of paper you need to tell CSS where it needs to place elements. Sounds simple, but given it if 3D and your don't see the 3D it makes CSS painful. Therefore it it were me I would reap elements in different html tags etc.
HTML
<body>
<div class="brand-group">
// use div tag for CSS background img insertions
<div class="brand-logo"></div>
</div>
// etc
CSS
body{
// width and height are important in the parent element. Without it CSS will just collapse
// going back to blank sheet of paper analogy. If you don't tell CSS the dimensions of the paper
// it will assume zero and start to build the document dimensions based on the elements you create
width: 1000px; // or use 100% or
min-height: 2000px;
// ... other body styling
}
// I like to use a wrapper as I can then place everything brand related into the wrapper
// e.g. logo, tagline, etc. I then position the wrapper and following that the elements within the wrapper
div.brand-group {
// I don't like static or fixed as you cannot use float, etc,, but I get why it is done
// position attribute is essential as you telling CSS who you want to position the logo relative to its parent
// in this case it is body (1000 x 2000)
postion: relative;
float: right;
// alternatively IF you use fixed or static then use this approach
// left: 100%
// left-margin: -215px; // adding 15px right gutter
// you can do something similiar using top if you want to push to top, but lets assume this is your first html element
width: 200px;
height: 100px; //you are not building the group size
top: margin: 15px;
}
div.brand-logo {
// easier to position logos using LESS or SASS as you have functions
// in pure CSS the easiest way to center the logo would be to look at the image dimensions'
// lets say it is 100px x 50px
left: 50%;
margin-left: -50px; // half the width of the image
top: 50%;
margin-top: - 25px; // half height
background-image: url('logo.png');
background-repeat: no-repeat;
background-color: #E6E6E6;
font-family: Arial;
font-size: medium;
}
I want to create an header image for my website.
I would like the image is always in the middle would have standing. When someone's browser reduced, the image in the center stand. Now I have an example that this site contains only get there no matter how this is done.
http://aarkcollective.com/
#Leeish has the right idea.
Another way is to use the following css
.center_element {
position: absolute;
top: 50%;
left: 50%;
margin-top: -50px; /* half of the height of the header */
margin-left: -150px; /* half of the width of the header*/
}
With the HTML:
<img class="center_element" src="images/header_image.jpg" width="300" height="100">
div{
margin: 0 auto;
width: [whatever]%;
}
As long as your image/div has a fixed width or percent so it scales, it will stay centered with a left and right margin of auto. This is probably a duplicate question so you should probably look around for another answer.
EDIT
I am editing my answer based on your comments. I made this fiddle to do what I was talking about. http://jsfiddle.net/P8eDT/ I put two divs in it. One with an image and one without so you can see. The inner div is flexible width, set height, and stays centered. The image inside the second one is "responsive" in that it will always match the width of the div. As far as I can tell this is exactly what they are doing in your example site you posted. Posted below is the code for the INNER div (The one that is the image).
#inner {
width: 50%;
height: 100px;
margin: 0 auto;
background-image: url(/path/to/image.jpg);
background-size: cover;
background-position: center;
}
Please note you will need a javascript fall back for older versions of IE that do not support background-size:cover. I've done this before and I just use javascript to measure the width/height and which ever is longer I just set that one.
you can use position:fixed in your css
say that your header has a class of .header and a width and height of 800x50
in your css try:
.header{position:fixed; top:50%; left:50%; margin:-25px 0 0 -400px;}
edit if you do not want it to center vertically Leeish has the better solution
What I'm trying to achieve without using JS can be seen on jsfiddle.net/k2h5b/.
Basically I would like to display two images, both centered, one in background and one in foreground:
Background Image: Should cover the whole window without affecting the aspect ratio, which means that the image will always touch two opposite edges of the window, but the image will be cropped.
Forground Image: Should be inside the window without affecting the aspect ratio, which means the image will be always touch two opposite edges of the window, but the image will not be cropped.
It doesn't matter if it's a <div> or an <img> tag, as long as they are displaying the images.
Asume also that the image sizes are known upfront and can be used in CSS or HTML part.
So my question is: is it possible using only CSS or CSS3?
If it's not possible I will accept the answer that will be as close as possible to my goal.
Examples:
When the background image is cropped from the top and bottom:
When the background image when it's cropped from left and right:
After looking at #Kent Brewster's answer, I think I could achieve all the requirements of OP.
This doesn't have the problem of foreground image being cropped and you can also specify constant margin around the foreground image. Also div is being used instead of img tag, because we are using background images. Here is the link and here is the code:
<div id='bg'></div>
<div id='fg'></div>
#bg {
position: absolute;
height: 100%;
width: 100%;
background-image: url(http://i.imgur.com/iOvxJ.jpg);
background-repeat: no-repeat;
background-position: 50% 50%;
background-size: cover;
}
#fg {
position: absolute;
top: 10px;
left: 10px;
bottom: 10px;
right: 10px;
opacity: .7;
background-image: url(http://i.imgur.com/HP9tp.jpg);
background-repeat: no-repeat;
background-position: 50% 50%;
background-size: contain;
}
Try this:
<html>
<style>
body {
margin: 0;
}
#bg {
position: absolute;
height: 100%;
width: 100%;
background: transparent url(bg.jpg) 50% 50% no-repeat;
background-size: cover;
}
#fg {
position: absolute;
height: 90%;
width: 90%;
top: 5%;
left: 5%;
background: transparent url(fg.jpg) 50% 50% no-repeat;
background-size: cover;
opacity: .7;
}
</style>
<body>
<div id="bg"></div>
<div id="fg"></div>
</body>
</html>
If the scaling requirement is flexible, it might work. See http://jsfiddle.net/k2h5b/5/ to see it run.
Yes, it's possible.
Basically I just made the background image the background for the <body> (doesn't have to be the body of course), and then put the image inside that with a small margin.
<body>
<img id='fg' src='http://3.bp.blogspot.com/-OYlUbWqyqog/TeL-gXGx3MI/AAAAAAAAHRc/bdqvvvaeC7c/s1600/bald-eagle3.jpg'></img>
</body>
css:
body {
margin: 0; padding: 0;
overflow: hidden;
background: url('http://wallpaper.zoda.ru/bd/2006/07/21/2c7b4306fd22f049f331d43adb74a5f7.jpg') no-repeat left top;
}
#fg {
margin: 20px 20px;
opacity: 0.7;
}
obviously if the window is too big, there'd be issues. You could (I guess) use media queries to pull in different image sizes based on window size.
edit — OK, well for the image, if you do want it to crop and retain the right aspect ratio, then I think you'll have to know the image size ahead of time to do it so that it works out. Lacking that, here's another revision.
<body>
<div id='fg'> </div>
</body>
css:
body {
margin: 0; padding: 0;
overflow: hidden;
background: url('http://wallpaper.zoda.ru/bd/2006/07/21/2c7b4306fd22f049f331d43adb74a5f7.jpg') no-repeat left top;
}
body, html { width: 100%; height: 100%; }
#fg {
margin: 2%; width: 96%; height: 96%;
opacity: 0.7;
background: url('http://3.bp.blogspot.com/-OYlUbWqyqog/TeL-gXGx3MI/AAAAAAAAHRc/bdqvvvaeC7c/s1600/bald-eagle3.jpg') no-repeat center center;
}
If you know the image dimensions, you could then set max-height and max-width. (I'll try that too :-)
edit again To get the background to crop in a centered way, you'd need to set the position to "center center" instead of "left top". (Or "center top" if you just want it centered horizontally.)
Vertically centering elements with CSS without cutting-edge non-standard features (flexible box layout) is hard. That may be something to do with JavaScript. I'll say that one problem with any JavaScript solution like that is that it really slows the browser down. If you must do it, I would suggest introducing a little time lag so that you don't try to recompute the layout on every resize event. Instead, set a timer for like 200 milliseconds in the future where the work will get done, and each time you do so cancel the previous timer. That way, while a person is dragging the window corner it won't burn up their CPU.
edit even more ooh ooh yes #Kent Brewster's answer with the vertical centering is good - I always forget that trick :-)
There is no way to achieve this effect using only CSS, for two main reasons:
Because you are trying to resize your image, you cannot use the background property and must instead use an <img> tag. Your image will always try to take up as much room as it can if the width and height are not set. Thus, the aspect ratio will not be maintained, or your image will be cropped.
The other caveat of resizing the image is that you will not be able to vertically-align it to the center of your page without knowing its dimensions.