如何清除浮动？手写clearfix
清除浮动的方法
- 父级加 overflow:hidden
- 父级设置 clearfix
- 父级也浮动
伪类清浮动法（手写clearfix）
.clearfix:after {
content: "";
display: block;
clear: both;
}
代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>如何清除浮动？手写clearfix</title>
</head>
<style>
.clearfix::after{
content: "";
display: block;
clear: both;
}
.box{
width: 500px;
margin: 50px auto;
border: 5px solid red;
}
.left{
float: left;
width: 200px;
height: 200px;
background-color: #ccc;
}
</style>
<body>
<div class="box clearfix">
<div class="left">left</div>
<div class="clear"></div>
</div>
</body>
</html>
