#classroom_nav{position:relative;left:0;top:0;overflow:hidden}#classroom_nav img{width:100%;display:block}#classroom_nav .container{position:relative;height:100%;width:100%}#classroom_nav .classroom-nav-tabs{position:absolute;left:0;bottom:0;width:100%;height:50px;line-height:50px;padding:0;margin-bottom:0}#classroom_nav .classroom-nav-tabs li{background:rgba(0,0,0,.5);border-right:1px solid #bbb}#classroom_nav .classroom-nav-tabs li:last-child{border:0}#classroom_nav .classroom-nav-tabs li:hover,#classroom_nav .classroom-nav-tabs li.active{background:rgba(255,185,18,.8)}#classroom_nav .classroom-nav-tabs li a{display:block;width:100%;height:100%;color:#fff;font-family:'微软雅黑';font-size:18px}