lovecoding
/
W250511


			
				
					
						
						
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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>
        /* BFC 区域  */
        /* 生成BFC区域后 内不元素不会与外部元素关联 */
        .box{
            width: 400px;
            height: 400px;
            background-color: blue;
            /* 开启 BFC */
            overflow: hidden;
        }
        /* 内部元素的margin-top 超出父元素范围。（外边距溢出） */
        .box2{
            width: 200px;
            height: 200px;
            background-color: red;
            margin-top: 100px;
            /* margin-left: 100px; */
        }

        .box3,.box4{
            width: 400px;
            height: 400px;
        }

        /* 垂直外边距合并 */
        .box3{
            background-color: red;
            margin-bottom: 50px;
        }
        .box4{
            margin-top: 50px;
            background-color: blue;
        }
        .box5{
            overflow: hidden;
        }
    </style>
</head>
<body>
    <!-- <div class="box">
        <div class="box2"></div>
    </div> -->
    <div class="box5">
        <div class="box3"></div>
    </div>
    <div class="box4"></div>

    
</body>
</html>