console 命令行工具 X clear
console
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<head>
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    <title>Document</title>
    <style type="text/css">
        div.container {
            width: 120%;
            margin: 1px;
            border: 3px skyblue gray;
            line-height: 100%;
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        div.header,
        div.footer {
            padding: 1em;
            color: blue;
            background-color: brown;
            clear: left;
        }
        
        h1.header {
            padding: 1;
            margin: 1;
        }
        
        div.left {
            float: left;
            width: 150px;
            margin: 1;
            padding: 2em;
        }
        
        div.content {
            margin-left: 200px;
            border-left: 2px solid blue;
            padding: 2em;
        }
    </style>
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        <div class="header">
            <h1 class="header">财经学院19级电子商务2班</h1>
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        <div class="left">
            <p>不要做过多的解释</p>
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        <div class="content">
            <h2>免费的网站</h2 <p>在W3Schoool你将找到所以关于网络建设的课程</p>
            <p>W3Cchool.com.cn-世界上最大的网站开发社区</p>
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            Copyright 2008 42号 苏冠华
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