lovecoding
/
W260426


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1{
            width: 400px;
            height: 400px;
            background-color: red;
            /* 开启BFC */
            overflow: hidden;
        }
        .box2{
            width: 200px;
            height: 200px;
            background-color: blue;
            margin-top: 50px;
            
        }

        .box3{
            width: 200px;
            height: 200px;
            background-color: green;
            margin-bottom: 100px;
        }
        .box4{
            width: 200px;
            height: 200px;
            background-color: yellow;
            margin-top: 30px;
        }
        .box5{
            overflow: hidden;
        }
    </style>
</head>
<body>
    <!-- 外边距溢出 -->
    <!-- BFC 隔绝内部与外界元素 让他们相互之间不会有接触 -->
     <!-- BFC 会创建一个独立的上下文环境 让内部元素不会影响到外部元素 -->
    <!-- overflow: hidden; 会触发BFC     -->
     <!-- <div class="box1">
        <div class="box2"></div>
    </div> -->

    <!--外边距合并 上下两个外边距会合并为一个 以最大的为准 -->
    <div class="box5">
        <div class="box3"></div>
    </div>
    <div class="box4"></div>
</body>
</html>