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I'm trying to get a pure CSS parallax effect working without having a fixed background height. This has been described in a few places, but they have the common constraint that the background layer must have a fixed, known height.
I would like to get the effect working without having a fixed, known height for the background due to some dynamic content.
My minimal example is here: https://jsfiddle.net/yf8oyben/
#container {
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
perspective: 1px;
overflow-x: hidden;
overflow-y: scroll;
}
.background {
transform: translateZ(-1px) scale(2);
width: 100%;
background: lightgreen;
height: 250px; /* Assumes bg height */
position: absolute; /* Assumes bg height */
top: calc(125px - 50vh); /* Assumes bg height */
}
.foreground {
background: rgba(0, 0, 255, 0.5);
width: 100%;
position: absolute; /* Assumes bg height */
top: 250px; /* Assumes bg height */
}<body>
<div id='container'>
<div id="group1">
<div class="background">
<div style="height: 10rem"></div>
<center>Banner</center>
<div style="height: 10rem"></div>
</div>
<div class="foreground">
<div style="height: 10rem"></div>
<center>Content</center>
<div style="height: 100rem"></div>
</div>
</div>
</div>
</body>It works now but assumes that the background is 250px, as annotated in the CSS. Is it possible to remove this and still retain the effect as it currently is?
842
You can achieve this parallax effect without knowing the height of the banner. you just need to drop the absolute positioning and adapt the perspective-origin and transform-orign properties They need to be positioned one on top of the other.
Here is a demo: CSS only parallax effect
*{margin:0;padding:0;}
#wrap{
position:fixed;
width:100%; height:100%;
overflow-x:hidden;
overflow-y:scroll;
perspective: 1px;
perspective-origin:0 0;
}
.bg{
background:teal;
transform-origin:0 0;
transform: translateZ(-1px) scale(2);
}
.bg img{
display:block;
width:100%; height:auto;
}
.cont{
position:relative;
background:rgba(0,0,0,0.8);
color:#fff;
padding:5%;
}
.cont *{
max-width:900px;
margin:5% auto;
}<div id="wrap">
<div class="bg">
<img src="http://i.imgur.com/hPLqUtN.jpg" alt="" />
</div>
<div class="cont">
<h1>Lorem Ipsum</h1>
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