.clearfix{*zoom:1}.clearfix:after{content:'';display:table;clear:both}.nav_wrapper{border-radius:5px;margin-bottom:10px;width:100%;overflow:hidden}.nav_wrapper .nav_li{float:left;width:111px;text-align:center;background:#f8f8f8}.nav_wrapper .nav_li.first .nav_li_ul{border-left:1px solid #eee}.nav_wrapper .nav_li.cur_li .nav_li_title{background:#7ac357}.nav_wrapper .nav_li.cur_li .arrow_down{display:block}.nav_wrapper .nav_li.cur_li .nav_li_ul{border-right-color:#e6eee0;background:#f7fdf3}.nav_wrapper .nav_li.cur_li .nav_li_title:after{content:'';display:block}.nav_wrapper .nav_li_title{height:40px;line-height:40px;background:#7dcc57 url(/common../images/k12_nav_repeat_x.png) repeat-x;position:relative}.nav_wrapper .nav_li_title a{color:#fff;font-weight:bold;font-size:14px}.nav_wrapper .nav_li_title:after{content:'';width:0;height:0;position:absolute;left:50%;top:40px;margin-left:-5px;display:none;border-top:5px solid #7ac357;border-left:5px solid transparent;border-right:5px solid transparent}.nav_wrapper .nav_li_ul{padding:10px 0;border-right:1px solid #eee}.nav_wrapper .nav_li_ul li{line-height:27px}.nav_wrapper .nav_li_ul li a{color:#666}