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<title>菜鸟教程(runoob.com)</title>
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<h2>按钮</h2>
<p>.btn-lg 类制作大按钮：</p>
<button type="button" class="btn btn-default btn-lg">大的默认按钮</button>
<button type="button" class="btn btn-info btn-lg">大的信息按钮</button>
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