写一个200宽高的div，上下左右居中

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
html,
body {
height: 100%;
}

 

body {
width: 100%;
position: relative;
}

 

div {
width: 200px;
height: 200px;
background-color: #f00;

 

position: absolute;
top: 50%;
left: 50%;
margin-top: -100px;
margin-left: -100px;
}
</style>
</head>
<body>
<div>

 

</div>
</body>
</html>
 
效果：上下左右都居中

 

 

 

posted @ 2021-04-27 15:57  #Friday  阅读(102)  评论(0)    收藏  举报