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4-29号作业双飞翼布局理解
蜗牛是条鱼
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实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <style>
        .header {
            height: 60px;
            background-color: #888888;
        }
        .container {
            width: 1000px;
            /*设置主体的宽度*/
            margin: 5px auto;
            /*跟上下保持间距*/
            background-color: lightgray;
            overflow: hidden;  /*重点操作，这里必须清除子元素的浮动效果*/
        }
        .wrap {
            /*给main加个套子来操作，更加方便*/
            width: inherit;
            min-height: 800px;
            /*高度宽度都继承主体的设置*/
            background-color: cyan;
        }

        .left {
            width: 200px;
            min-height: 800px;
            background-color: lightcoral;
            margin-left: -100%;  /* 关键操作，浮动后必须用margin拉回它应该在的位置 -100%就是反反向拉整个宽度回去*/
        }
        /* 右边栏样式 */
        .right {
            width: 200px;
            min-height: 800px;
            background-color: lightseagreen;
            margin-left:-200px; /* 关键操作，浮动后必须用margin拉回它应该在的位置 -200px就是反方向拉到最右边的位置*/
        }
        .wrap, .left, .right {
            float: left;    /* 浮动必须，否则在文档流中不能按自己需求排版 这里注意是浮动 .wrap 不是.main*/
        }
        .main {
            /*这里的两边padding是给主体内容去挤出位置来，因为中间没有设置宽度*/
            padding-left: 200px;
            padding-right: 200px;
        }
        .footer {
            height: 60px;
            background-color: #888888;
        }
    </style>
    <!--<link rel="stylesheet" href="css/style8.css">-->
    <title>双飞翼布局实战</title>
</head>
<body>
<div class="header"></div>
<div class="container">
    <div class="wrap">
        <div class="main">主题内容区</div>
    </div>
    <div class="left">左侧内容</div>
    <div class="right">右侧内容</div>
</div>
<div class="footer"></div>
</body>
</html>

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Correction status：Uncorrected

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