how to achieve adaptive this?
how to achieve adaptive this?
is that the height is half the width adaptive
img has a feature: when only width is written, the height is proportional
, so you can use the 2:1 picture to open the container, and the rest is to be a little clever
as for the center, this is not difficult, you can handle it yourself
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.fix-clear:after {content:'\200B';clear:both;height:0;visibility:hidden;display:block;}
.base {position:relative;display:inline-block;box-shadow:0 0 2px 0 -sharp000;}
.base .box {background-color:rgba(255,0,0,0.5);}
.base img {float:left;margin-right:-100%;width:100%;}
</style>
<script>
document.addEventListener('DOMContentLoaded', function(){
let domBox = document.querySelector('.base .box');
function update()
{
let txt = '';
let cnt = Math.floor(5 + (Math.random() * 20));
domBox.innerHTML = txt.substr(0, cnt);
setTimeout(update, 1000);
}
setTimeout(update, 0);
});
</script>
</head>
<body>
<div class="base fix-clear">
<!-- 200 * 100 PNG 200 -->
<img src="data:image/png;base64,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"/>
<div class="box"></div>
</div>
</body>
</html>.box{
position: relative;
width: 200px;
}
.box-child{
width: 100%;
height: 0;
padding-top: 50%;
//
position: absolute; // fixed
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}padding-top% defines the upper inner margin based on the percentage width of the parent element. w3c----padding-top
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