案例:CSS案例     状态:可编辑再运行    进入竖版
 运行结果 
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<html>
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<head>
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<style type="text/css">
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#mostImportant {color:red; background:yellow;}
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</style>
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</head>
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<body>
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<h1 id="mostImportant">This is important!</h1>
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<p>This is a paragraph.</p>
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<p>This is a paragraph.</p>
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<p>This is a paragraph.</p>
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<p>...</p>
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</body>
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</html>
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