代码简介：
【荐】纯CSS打造超酷的圆角菜单，鼠标移过向上/向下扩张
代码内容：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>【荐】纯CSS打造超酷的圆角菜单，鼠标移过向上/向下扩张_网页代码站(www.webdm.cn)</title>
<style type="text/css">
#outer {display:block; position:relative; background:#eee; padding:2em; text-align:center;}
#outer h2 {margin-bottom:1em;}
#navigation {background:transparent; margin:0 auto; height:3em;
/* hide overflow:hidden from IE5/Mac */
/* \*/
overflow: hidden;
/* */ }
#navigation ul {margin:0; padding:0; list-style-type:none; background:transparent;}
#navigation li {display:block; float:left; margin:0 1px;}
.snazzy {background:transparent;}
.snazzy span {text-align:center; color:#fff; margin:0; font-weight:normal;}
.b1, .b2, .b3, .b4 {display:block; font-size:1px;
/* hide overflow:hidden from IE5/Mac */
/* \*/
overflow: hidden;
/* */ }
.b1, .b2, .b3 {height:1px;}
.b2, .b3, .b4 {border-left:1px solid #fff; border-right:1px solid #fff;}
.b1 {margin:0 5px; background:#fff;}
.b2 {margin:0 3px; border-0 2px;}
.b3 {margin:0 2px;}
.b4 {height:2px; margin:0 1px;}
.boxcontent {display:block; border-left:1px solid #fff; border-right:1px solid #fff;}
a.menu, a.menu:visited {display:block; text-decoration:none; 5.5em;}
a.menu:hover {background:transparent; cursor:pointer;}
a.menu:hover span {padding-top:10px; background:#888;}
a:menu:hover b {background:#888;}
.red {background:#c00;}
.orange {background:#f90;}
.yellow {background:#b8b800;}
.green {background:#090;}
.blue {background:#00c;}
.indigo {background:#309;}
.violet {background:#c6c;}
.grey {background:#888;}
a:hover b.red {background:#888;}
a:hover b.orange {background:#888;}
a:hover b.yellow {background:#888;}
a:hover b.green {background:#888;}
a:hover b.blue {background:#888;}
a:hover b.indigo {background:#888;}
a:hover b.violet {background:#888;}
.active {padding-top:10px; background:#888; cursor:default;}
#navigation2 {clear:both; background:transparent; margin:0 auto; height:3em;
/* hide overflow:hidden from IE5/Mac */
/* \*/
overflow: hidden;
/* */ }
#navigation2 ul {margin:0; padding:0; list-style-type:none; background:transparent;}
#navigation2 li {display:block; float:left; margin:0 1px;}
.pad {display:block; height:1em;
/* hide overflow:hidden from IE5/Mac */
/* \*/
overflow: hidden;
/* */ }
a.menu2, a.menu2:visited {display:block; text-decoration:none; 5.5em;}
a.menu2:hover {background:transparent; cursor:pointer;}
a.menu2:hover .boxcontent {padding-bottom:0.8em; background:#888;}
a.menu2:hover .pad {height:0.2em;}
</style>
</head>
<body>
<div id="wrapper"><!-- end of page_head -->
<div id="info">
<h2>More snazzy border menus</h2>
<div id="outer">
<div id="navigation">
<ul>
<li> <a class="menu" href="#nogo"><b class="snazzy"><span class="boxcontent red">item #1</span> <b class="b4 red"></b><b class="b3 red"></b><b class="b2 red"></b><b class="b1"></b> </b></a>
</li>
<li> <a class="menu" href="#nogo"><b class="snazzy"><span class="boxcontent orange active">item #2</span> <b class="b4 grey"></b><b class="b3 grey"></b><b class="b2 grey"></b><b
class="b1"></b> </b></a> </li>
<li> <a class="menu" href="#nogo"><b class="snazzy"><span class="boxcontent yellow">item #3</span> <b class="b4 yellow"></b><b class="b3 yellow"></b><b class="b2 yellow"></b><b
class="b1"></b> </b></a> </li>
<li> <a class="menu" href="#nogo"><b class="snazzy"><span class="boxcontent green">item #4</span> <b class="b4 green"></b><b class="b3 green"></b><b class="b2 green"></b><b class="b1"></b>
</b></a> </li>
<li> <a class="menu" href="#nogo"><b class="snazzy"><span class="boxcontent blue">item #5</span> <b class="b4 blue"></b><b class="b3 blue"></b><b class="b2 blue"></b><b class="b1"></b>
</b></a> </li>
<li> <a class="menu" href="#nogo"><b class="snazzy"><span class="boxcontent indigo">item #6</span> <b class="b4 indigo"></b><b class="b3 indigo"></b><b class="b2 indigo"></b><b
class="b1"></b> </b></a> </li>
<li> <a class="menu" href="#nogo"><b class="snazzy"><span class="boxcontent violet">item #7</span> <b class="b4 violet"></b><b class="b3 violet"></b><b class="b2 violet"></b><b
class="b1"></b> </b></a> </li>
</ul>
</div>
<!-- end of navigation -->
<h3>TAB DOWN</h3>
<h3>TAB UP</h3>
<div id="navigation2">
<ul>
<li> <a class="menu2" href="#nogo"><b class="pad"></b><b class="snazzy"><b class="b1"></b><b class="b2 red"></b><b class="b3 red"></b><b class="b4 red"></b><span class="boxcontent red">item
#1</span> </b></a> </li>
<li> <a class="menu2" href="#nogo"><b class="pad"></b><b class="snazzy"><b class="b1"></b><b class="b2 orange"></b><b class="b3 orange"></b><b class="b4 orange"></b><span class="boxcontent
orange">item #2</span> </b></a> </li>
<li> <a class="menu2" href="#nogo"><b class="pad"></b><b class="snazzy"><b class="b1"></b><b class="b2 yellow"></b><b class="b3 yellow"></b><b class="b4 yellow"></b><span class="boxcontent
yellow">item #3</span> </b></a> </li>
<li> <a class="menu2" href="#nogo"><b class="pad"></b><b class="snazzy"><b class="b1"></b><b class="b2 green"></b><b class="b3 green"></b><b class="b4 green"></b><span class="boxcontent
green">item #4</span> </b></a> </li>
<li> <a class="menu2" href="#nogo"><b class="pad"></b><b class="snazzy"><b class="b1"></b><b class="b2 blue"></b><b class="b3 blue"></b><b class="b4 blue"></b><span class="boxcontent
blue">item #5</span> </b></a> </li>
<li> <a class="menu2" href="#nogo"><b class="pad"></b><b class="snazzy"><b class="b1"></b><b class="b2 indigo"></b><b class="b3 indigo"></b><b class="b4 indigo"></b><span class="boxcontent
indigo">item #6</span> </b></a> </li>
<li> <a class="menu2" href="#nogo"><b class="pad"></b><b class="snazzy"><b class="b1"></b><b class="b2 violet"></b><b class="b3 violet"></b><b class="b4 violet"></b><span class="boxcontent
violet">item #7</span> </b></a> </li>
</ul>
</div>
<!-- end of navigation2 -->
</div>
<!-- end of outer -->
</div>
<!-- end of info -->
<!-- end of content -->
<!-- end of page_foot -->
</div>
<!-- end of wrapper -->
</body>
</html>
<br>
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代码来自：http://www.webdm.cn/webcode/9f3019a7-bac1-4e7c-8d77-b5bcc06e6a15.html