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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p.important {color:red;}
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h1.important {color:blue;}
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</style>
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</head>
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​
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<body>
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<h1 class="important">This heading is very important.</h1>
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​
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<p class="important">This paragraph is very important.</p>
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​
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<p>This is a paragraph.</p>
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​
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<p>This is a paragraph.</p>
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​
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<p>This is a paragraph.</p>
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​
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<p>...</p>
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</body>
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</html>
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​