margin塌陷（仅限在标准文档流中） 

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        section{
            width: 100px;
            height: 100px;
            background-color: hotpink;
        }
        #one{
            margin-bottom: 100px;
        }
        #two{
            margin-top: 200px;
        }
    </style>
</head>
<body>
<section id="one">123</section>
<section id="two">456</section>
</body>
</html>

posted @ 2019-12-17 14:06  杨小越  阅读(259)  评论(0)    收藏  举报