案例:Bootstrap案例     状态:可编辑再运行    进入竖版
 运行结果 
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<!DOCTYPE html>
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<html>
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<head>
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    <meta charset="utf-8">
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    <title>Bootstrap 实例 - 居中内容块</title>
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    <link rel="stylesheet" href="/css/bootstrap/bootstrap3.3.7.min.css">  
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    <script src="/js/bootstrap/jquery.min.js"></script>
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    <script src="/js/bootstrap/bootstrap3.3.7.min.js"></script>
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</head>
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<body>
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<div class="row">
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    <div class="center-block" style="width:200px;background-color:#ccc;">
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        这是 center-block 实例
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    </div>
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</div>
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</body>
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</html>