2-14編程練習，請老師看一下！

来源：2-14 编程练习

慕数据3203843

2019-08-30 19:15:21

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .per{
            width: 300px;
            height: auto;
            border:2px solid #aaa;
            overflow:hidden;
        }
        .li{
            width: 100px;
            height: 100px;
            background: red;
            margin: 5px;
            float: left;
        }
        /*此处写代码*/
        .clear{clear:both;}
        
       /* .clearfix{ */
       /*content:'.';   */
       /* height:0;  */
       /* display:block; */
       /* visibility:hidden; */
       /* clear:both;}*/
        
    </style>
</head>
<body>
    <div class="per clearfix">
        <div class="li"></div>
        <div class="li"></div>
        <!-- 此处写代码 -->
        <div class="clear"></div>
    </div>
</body>
</html>

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