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<title>混合布局编程挑战</title>
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body{ margin:0; padding:0; font-size:30px; color:#fff}
.top{height: 50px;margin: 0 auto;background-color: red;}
.main{background-color: green;position: relative;}
.right{background-color: pink;position: absolute;top: 0;right: 0;left: 210px;}
.left{ width: 200px;height: 400px;background-color: yellow;}
.foot{height: 50px;margin: 0 auto;background-color: blue;}
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<div class="top">top</div>
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<div class="right">rightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightrightright</div>
<div class="left">left</div>
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<div class="foot">foot</div>
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