带圆角的纯CSS下拉导航菜单

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>纯CSS的圆角二级下拉菜单</title>
<style type="text/css">
#menu {list-style-type:none; margin:40px auto 100px auto; padding:0; width:608px;}
#menu li {float:left; padding:0; margin:0 1px 0 0; position:relative; width:150px; height:3em; z-index:100;}
#menu li dl {position:absolute; top:0; left:0; padding-bottom:0;}
#menu li a, #menu li a:visited {text-decoration:none;}
#menu li dd {display:none;}
#menu li a:hover {border:0;}
#menu li:hover dd, #menu li a:hover dd {display:block;}
#menu li:hover dl, #menu li a:hover dl {padding-bottom:10px;}
#menu table {border-collapse:collapse; padding:0; margin:-1px; font-size:1em;}
#menu dl {width: 150px; margin: 0; padding: 0; background: transparent;}
#menu dt {margin:0; padding: 0;}
#menu dd {margin:0; padding:0; color: #fff; font-size: 1em; text-align:left;}
#menu dt a, #menu dt a:visited {display:block; font-size: 0.9em; color: #038; text-align:center; border:1px solid #08c; border-width:0 1px 1px 1px; background:#d4d4d4; padding:0.25em 0 0.75em 0;}
#menu li:hover dt a, #menu a:hover dt a {color:#006; background:#ddd; border:1px solid #08c; border-width:0 1px 1px 1px;}
#menu dd a, #menu dd a:visited {background:#08c; color:#fff; padding:0.5em 0; text-decoration:none; display:block; text-align:center; border-left:1px solid #08c; border-right:1px solid #08c;}
#menu dd a:hover {background: #ddd; color:#000; border-left:1px solid #08c; border-right:1px solid #08c;}
#menu b {display:block; overflow:hidden; height:1px;}
#menu b.p1 {background:#08c; margin:0 5px;}
#menu b.p2 {background:#d4d4d4; border:2px solid #08c; border-width:0 2px; margin:0 3px;}
#menu b.p3 {background:#d4d4d4; margin:0 2px; border:1px solid #08c; border-width:0 1px;}
#menu b.p4 {height:2px; background:#d4d4d4; margin:0 1px; border:1px solid #08c; border-width:0 1px;}
#menu b.p5 {background:#08c; margin:0 5px;}
#menu b.p6 {background:#08c; margin:0 3px;}
#menu b.p7 {background:#08c; margin:0 2px;}
#menu b.p8 {height:2px; background:#08c; margin:0 1px;}
#menu li:hover b.p2, #menu a:hover b.p2 {background:#fff;}
#menu li:hover b.p3, #menu a:hover b.p3 {background:#f0f0f0;}
#menu li:hover b.p4, #menu a:hover b.p4 {background:#e8e8e8;}
</style>
</head>
<body>
<ul id="menu">
<li>
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<dl>
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