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#nav ul { list-style-type:none; }
#nav ul li { float:left; position: relative;}
#nav ul li a { border-right:1px solid #e9e9e9; padding:20px; display:block; text-decoration:none; text-
align:center; color:#999;}
#nav ul li ul {display: none;}
#nav ul li:hover ul {display: block; position: absolute; top:56px; min-width:190px; left:0;}
#nav ul li:hover ul li a {display:block; background:green; color:#ffffff; width: 110px; text-align:
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原文地址：http://www.cnblogs.com/275147378abc/p/5013422.html
