一、效果
本身元素width:100px,绝对定位后:left:50px,如下图所示.
二、代码如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{padding: 0;margin: 0;}
.test {
width: 100px;
height: 100px;
background: green;
}
.test:after {
position: absolute;
left: 50px;
content: "12";
background: grey;
width: 50px;
height: 50px;
}
</style>
</head>
<body>
<div class=‘test‘></div>
</body>
</html>
原文：https://www.cnblogs.com/arun-python/p/12960928.html