.banner{width:100%;height:650px;font-size:0;overflow:hidden;position:relative; background:#000;}.banner_img{width:100%;height:650px;position:absolute;left:0;top:0}.banner_img li{width:100%;height:650px;display:inline-block;background-position:center;background-repeat:no-repeat;float:left;list-style:none}.banner_list{height:50px;top:585px;position:relative;margin:0 auto;z-index:1}.banner_list span{display:block;cursor:pointer;width:14px;height:14px;border-radius:50%;border:3px solid #555;float:left;margin:0 5px}.banner_list .spcss{border:3px solid #ffffff}.banner_left{position:absolute;height:90px;width:60px;top:50%;left:-60px;background-color:rgba(73,72,62,.6);margin-top:-45px;text-align:center;transition:all .5s;z-index:2}.banner_left:hover{background-color:rgba(73,72,62,.9)}.banner_right{position:absolute;height:90px;width:60px;top:50%;right:-60px;background-color:rgba(73,72,62,.6);margin-top:-45px;text-align:center;transition:all .5s;z-index:2}.banner_right:hover{background-color:rgba(73,72,62,.9)}.banner_left img{margin-top:22px}.banner_right img{margin-top:22px}