代码编辑器:
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<meta charset="utf-8"><link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>
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<style>
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* {
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box-sizing: border-box;
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}
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.header {
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border: 1px solid red;
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padding: 15px;
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}
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.menu {
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width: 25%;
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float: left;
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padding: 15px;
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border: 1px solid red;
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}
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.main {