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7、垂直塌陷.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .box {
            width: 200px;
            height: 200px;
            background-color: #eee;
            margin-bottom: -50px;
        }

        .box1 {
            width: 200px;
            height: 200px;
            background-color: blue;
            margin-top: -100px;
        }
    </style>
</head>

<body>
    <div class="box">

    </div>
    <div class="box1">

    </div>
</body>

</html>