简单的CSS下拉菜单

@charset "utf-8"*{margin: 0;padding:0;}#links{width: 500px;z-index: 100;}#links ul{height: 20px;list-style-type: none;}#links ul li{float: left;margin-left: 5px;width: 100px;height: 20px;position: relative;}#links ul li ol{list-style-type: none;position: absolute;right: 0px;visibility: hidden;}#links ul li:hover ol{visibility: visible;}#links ul li a{text-decoration: none;display: block;width: 100px;height: 20px;}#links ul li a:hover{text-decoration: underline;}