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abs-center.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>绝对居中</title>
<style>
.a {
border: 1px solid black;
width: 600px;
height: 400px;
position: relative;
}
.b {
border: 1px solid black;
width: 300px;
height: 200px;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
}
.c {
border: 1px solid black;
width: 600px;
height: 400px;
position: relative;
}
.qq {
width: 300px;
height: 200px;
position: absolute;
left: 50%;
top: 50%;
}
.d {
width: 100%;
height: 200px;
margin-left: -50%;
margin-top: -100px;
border: 1px solid black;
}
</style>
</head>
<body>
<div class="a">
<div class="b"></div>
</div>
<div class="c">
<div class="qq">
<div class="d"></div>
</div>
</div>
<div class="e">
<div class="f"></div>
</div>
</body>
</html>