html
<!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>垂直外边距塌陷</title>
<style>
/* 相邻的垂直外边距塌陷 */
.box1 {
width: 100px;
height: 100px;
background: pink;
margin-bottom: 20px;
}
.box2 {
width: 100px;
height: 100px;
background: pink;
margin-top: 10px;
}
/* 嵌套的垂直外边距塌陷 */
.father {
width: 200px;
height: 200px;
background: blue;
}
.son {
width: 50px;
height: 50px;
margin-top: 50px;
background: pink;
}
</style>
</head>
<body>
<!-- 相邻的垂直外边距塌陷，咱俩的关系没有那么好！ -->
<div class="box1"></div>
<div class="box2"></div>
<!-- 嵌套的垂直外边距塌陷 儿子把爹边距下来了-->
<div class="father">
<div class="son">
</div>
</div>
</body>
</html>