纯css实现圆角风格导航菜单，这个导航菜单鼠标经过时弹出下拉菜单并带滚动条显示，可根据自己的需求来修改即可。
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<title>纯css实现带滚动条圆角导航菜单_武鸣人</title>
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<style type="text/css">
.menu
{font-family: verdana, arial, sans-serif; width:500px; padding:20px 0 100px 100px; position:relative;z-index:100;}
/* remove the bullets and set the margin and padding to zero for the unordered list */
.menu ul
{padding:0; margin:0; list-style-type: none; border:0;}
/* float the list so that the items are in a line */
.menu ul li
{float:left; position:relative; margin-right:1px;}
/* style the links to be 150px wide by 25px high. Set the background color and the font size. */
.menu ul li a,
.menu ul li a:visited
{display:block; text-align:left; text-decoration:none; width:150px; height:25px; color:#aaa; background:#fff url(/img/20240507_www_wuming_ren_1.gif); line-height:24px; font-size:11px; text-indent:10px;}
/* Get rid of any default table style */
table {border-collapse:collapse;margin:0; padding:0;}
/* make the dropdown ul invisible */
.menu ul li ul {display:none; text-align:left; position:absolute; top:25px; left:-20px; text-align:left;z-index:100; padding:0 30px 20px 20px; background:url(/img/20240507_www_wuming_ren_2.gif) 20px 100% no-repeat;}
/* set the foreground color of the main menu li on hover and the border to trigger IE */
.menu ul li:hover a,
.menu ul li a:hover
{color:#fff; border:0;}
/* make the sub menu ul visible and position it beneath the first list item */
.menu ul li:hover ul,
.menu ul li a:hover ul
{display:block;}
/* make the sub menu ul li the full width with padding and border. Add an auto scroll bar */
.menu ul li:hover ul li,
.menu ul li a:hover ul li
{background:#363636; color:#000; width:149px; height:100px;overflow:auto; border-left:1px solid #7a7a7a;}
/* hack the widht for IE5.5 */
* html .menu ul li a:hover ul li {width:150px; w\idth:149px;}
/* style the background and foreground color of the submenu links */
.menu ul li:hover ul li a,
.menu ul li a:hover ul li a
{float:left; display:block; background:#363636; color:#aaa; width:129px; text-align:left; text-decoration:none; border:0; text-indent:10px;}
/* style the background and forground colors of the links on hover */
.menu ul li:hover ul li a:hover,
.menu ul li a:hover ul li a:hover
{text-decoration:none; color:#fff; background:#222;}
</style>
<!--[if lt IE 7]>
<style type="text/css">
.menu ul li ul {display:block; visibility:hidden;}
.menu ul li a:hover ul {visibility:visible;}
</style>
<![endif]-->
<!--[if IE]>
<style type="text/css">
.menu ul li:hover ul li,
.menu ul li a:hover ul li
{
scrollbar-arrow-color: #aaa;
scrollbar-3dlight-color: #888;
scrollbar-highlight-color: #666;
scrollbar-face-color: #444;
scrollbar-shadow-color: #000;
scrollbar-darkshadow-color: #888;
scrollbar-track-color: #363636;
}
</style>
<![endif]-->
<body>
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