2-14 编程练习作业提交

来源：2-14 编程练习

MiMicccc

2020-08-31 11:48:08

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .test {
            width: 800px;
            height: 100px;
            background: red;
            /*此处写代码*/
            position: fixed;
            top: 0;
            left: 50%;
            margin-left: -400px;
            /* left：50%搭配margin-left：-自身宽度的一半   right：50%搭配margin-ringht：-自身宽度的一半 */
        }
        .out {
            width: 100%;
            height: 2000px;
            background-color: #abcdef;
        }
    </style>
</head>
<body>
    <div class="out">
        <div class="test"></div>
    </div>
</body>
</html>

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