<!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>Document</title>
<style>
.zhong{
position: absolute;
left: 50%;
top: 50%;
margin-left: -200px;
margin-top: -100px;
width: 400px;
height: 200px;
border: solid red 1px;
text-align: center;
line-height: 200px;
}
</style>
</head>
<body>
<div class="zhong">定位居中</div>
</body>
</html>
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