外边距距离塌陷
在css盒子模型中是会存在垂直方向上的外边距塌陷:
<style>
.father{
width: 200px;
height: 200px;
background-color: orange;
margin-top: 100px;
}
.son{
width: 100px;
height: 100px;
background-color: skyblue;
margin-top: 100px;
}
.brother1{
width: 200px;
height: 200px;
background-color: purple;
margin-bottom: 100px;
}
.brother2{
width: 200px;
height: 200px;
background-color: red;
margin-top: 100px;
}
</style>
</head>
<body>
<!-- 我们发现div在处于父子或者兄弟关系是,在垂直方向上会存在外边距塌陷 -->
<div class="father">
<div class="son"></div>
</div>
<div class="brother1">
</div>
<div class="brother2"></div>

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