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来源：5-4 编程练习

piii

2020-08-04 23:44:51

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .per{
            width: 300px;
            height: auto;
            border:2px solid #aaa;
        }
        .li{
            width: 100px;
            height: 100px;
            background: red;
            margin: 5px;
            float: left;
        }
        .clear{
            clear: both;
        }
    </style>
</head>
<body>
    <div class="per">
        <div class="li"></div>
        <div class="li"></div>
        <div class="clear"></div>
    </div>
</body>
</html>

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