<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>解决高度塌陷</title>
<style>
.box1{
border: 10px red solid;
}
.box2{
width: 100px;
height: 100px;
background-color: cadetblue;
float: left;
}
.box1::after{
content: '';
display: block;
clear: both;
}
/*box3没有脱离文档流，box3会把box1高度撑起来*/
/*.box3{*/
/* clear: both;*/
/*}*/
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
<!-- <div class="box3"></div>-->
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>解决外边距重叠</title>
<style>
.box1{
width: 200px;
height: 200px;
background-color: aqua;
}
.box2{
width: 100px;
height: 100px;
background-color: fuchsia;
margin-top: 100px;
}
/*可以同时解决高度塌陷和外边距重叠问题*/
.clearfix::before,.clearfix::after{
content: '';
display: table;
clear: both;
}
</style>
</head>
<body>
<div class="box1 clearfix">
<div class="box2"></div>
</div>
</body>
</html>
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