Fit div size to background image

4
votes

I'm trying to set the size (both width and height) of a div to match it's background image size, but I can't get it working. The background image size has to be in percentages, because I'm dealing with a responsive website. On smaller screens, the background should be displayed completely (with less width, but still proportional), and the div who has the image should follow that size.

I tried various values of the background-size, such as auto 100%, cover, contain, etc. but nothing did the trick. There's a similar question here about this: scale div to background image size but it didn't solve my problem either.

I'd really appreciate if someone knows how to do it.

EDIT: I made a fiddle to show the behavior: http://jsfiddle.net/osv1v9re/5/ This line is what is making the background image so small:

background-size: auto 100%;

But if it is removed is removed, the background will fill the proper width, but not the height.

3
cssresponsive-designbackground-size
We would like to solve your problem if you can give us the code you are trying - m4n0
Make a fiddle so we can help you - Shadi Namrouti
<div> tag cannot adapt to background-image size, you need to use an <img> tag and choose between height: auto for the div or javascript - Heah
It's no possible unless you know the image' width and height at every breakpoint. Another way to do this is to set the background-image to cover on the div. Here's an example. codepen.io/pacMakaveli/pen/oXLPKd - Vlad
Can't you have the div size in percentage and the background-size to contain ? - Heah

3 Answers

9
votes

tag cannot adapt to background-image size, you need to use an tag and choose between height: auto for the div or javascript

// **** Problem ****

// Wrong html :
<div class="my_class"><div>

// with css :
.my_class {
    width: 100%;
    height: 100%;
    background-image: url(/images/my-image.jpg);
    background-size: 100%;
    background-position: center;
    background-repeat: no-repeat;
}

//****  Solution ****

// use css:
.my_class {
    width: 100%;
    height: 100%;
    background-image: url(/images/my-image.jpg);
    background-size: contain;
}
3
votes

*{
    padding: 0;
    margin: 0;
}


div{
    width: 100%;
}
div figure{
    padding-top: 36.56%;  /* 702px/1920px = 0.3656 */
    display: block;
    background: url("https://st.fl.ru/images/landing/bg2.jpg") no-repeat center top;
    background-size: cover;  
}
<div>    
    <figure></figure>
</div>
3
votes

you can have a responsive height using the padding-bottom or padding-top because you can't fix an height property in '%' with a width in '%'.

div{

	background-image: url(url);
	background-repeat: no-repeat;
	background-size: 100% 100%;
	background-position: center;

	margin: 0 auto;

	width: 100%;
	padding-bottom:  heightPicure / widthPicture + %; //do it manually or using scss rules

}