2-10 编程练习作业提交

来源：2-10 编程练习

MiMicccc

2020-08-31 11:25:36

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        /*完善下列代码*/
        .per {
            width: 300px;
            height: 300px;
            background: red;
            margin-left: 200px;
            margin-top: 200px;
            position: relative;
        }
        .son {
            width: 100px;
            height: 100px;
            background: blue;
            position: absolute;
            left: 0;
            top: 0;
            right: 0;
            bottom: 0;
            margin: auto auto;
        }
    </style>
</head>
<body>
    <div class="per">
        <div class="son"></div>
    </div>
</body>
</html>

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