代码语言：javascript复制
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
/*div
{
width:200px;
height:200px;
background:red;
position: absolute;
left: 50%;
margin: (-200px*0.5);
}*/
/*编译后的css文件*/
div {
width: 200px;
height: 200px;
background: red;
position: absolute;
left: 50%;
margin: -100px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
