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    <head>
        <title>菜鸟教程(runoob.com)</title> 
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    <body>

        <div class="container">
            <h2>排版</h2>
            <p> .list-unstyled 类移除了默认的列表样式，列表项左对齐 (直接子元素):</p>
            <ul class="list-unstyled">
                <li>Coffee</li>
                <li>Tea
                    <ul>
                        <li>Black tea</li>
                        <li>Green tea</li>
                    </ul>
                </li>
                <li>Milk</li>
            </ul>
        </div>

    </body>
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