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<html xmlns="http://www.w3.org/1999/xhtml">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
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*{ margin:0px auto; padding:0px}
#d1{
width:0px;
height:0px;
border-bottom:200px solid #00C;
border-left:200px solid #9F3;
border-right:200px solid #FF3;
border-top:200px solid #93F;}
</style>
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<body>
<div id="d1""></div>
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原文：http://www.cnblogs.com/bhmmlxieliming/p/6105507.html