<!DOCTYPE html><html lang="en">
<head> <meta charset="UTF-8">
<title>垂直居中</title>
<style>
* {
margin: 0;
padding: 0;
}
.center {
width: 960px;
height: 500px;
margin: 0 auto;
background: #1879D9;
}
.center p {
background: #fff;
position: relative;
top: 50%;
transform: translateY(-50%);
left: 0;
right: 0;
margin: 0 auto;
width: 100px;
}
</style>
</head><body> <div class="center">
<p>垂直居中内容</p>
</div>
</body></html>原理 transform: translateY(-50%); 让div 沿Y轴平移自身高度的一半
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效果如图: