标签：
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN">
<head>
<title>new</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="description" content="Akira.Juggling" />
<style>
div{
width: 0px;
height: 0px;
border-top: 50px solid darkblue ;
border-right: 50px solid red;
border-bottom: 50px solid darkgreen;
border-left: 50px solid blue;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
效果
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原文地址：http://www.cnblogs.com/webph/p/5131976.html
