<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
*{
margin:0;
padding:0;
}
.nav {
list-style-type:none;
}
.nav li {
width:200px;
height:35px;
border:1px #999 solid;
float:left;
text-align:center;
line-height:35px;
position:relative;
}
.nav li ul {
position:absolute;
}
.nav li ul li {
background-color:#CCC;
}
</style>
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