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@@ -0,0 +1,56 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ /* BFC 区域 */
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+ /* 生成BFC区域后 内不元素不会与外部元素关联 */
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+ .box{
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+ width: 400px;
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+ height: 400px;
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+ background-color: blue;
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+ /* 开启 BFC */
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+ overflow: hidden;
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+ }
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+ /* 内部元素的margin-top 超出父元素范围。（外边距溢出） */
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+ .box2{
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+ width: 200px;
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+ height: 200px;
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+ background-color: red;
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+ margin-top: 100px;
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+ /* margin-left: 100px; */
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+ }
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+
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+ .box3,.box4{
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+ width: 400px;
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+ height: 400px;
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+ }
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+
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+ /* 垂直外边距合并 */
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+ .box3{
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+ background-color: red;
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+ margin-bottom: 50px;
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+ }
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+ .box4{
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+ margin-top: 50px;
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+ background-color: blue;
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+ }
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+ .box5{
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+ overflow: hidden;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <!-- <div class="box">
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+ <div class="box2"></div>
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+ </div> -->
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+ <div class="box5">
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+ <div class="box3"></div>
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+ </div>
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+ <div class="box4"></div>
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+
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+
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+</body>
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+</html>
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