下拉如圖：
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<title>二級菜單居中的橫向下拉菜單</title>
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* {margin:0;padding:0;border:0;}
body {
font-family: arial, 宋體, serif;
font-size:12px;
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#nav {
height: 25px; list-style-type: none; padding-left:200px;
line-height:25px;overflow:hidden;background:#0066CC;
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#nav a {
display: block; width: 80px; text-align:center;
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#nav a:link {
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width: 520px; //注意,這裏一定要設置寬度;
position: absolute;
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#nav li ul li{
float: left;width: 80px; //float就是子菜單橫向的關鍵,可以繼承父菜單而省略float
}
#nav li ul a{
display: block; width: 65px;text-align:left;padding-left:15px;
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