clearfix可以解决外边距重叠和高度塌陷的问题
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>clearfix</title>
<style>
.box1{
border: red solid 5px;
}
/* .box1::before{
content: "";
display: table;
} */
.box2{
width: 200px;
height: 200px;
background-color: orange;
float: left;
}
.clearfix::before ,
.clearfix::after{
content: "";
display: table;
clear: both;
}
</style>
</head>
<body>
<!-- clearfix可以解决外边距重叠和高度塌陷的问题 -->
<div class="box1 clearfix">
<div class="box2 "></div>
</div>
</body>
</html>
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