.none{display:none}.banner{min-width:1200px;height:650px;position:relative;margin:0 auto;overflow:hidden;z-index:1}.banner_show{width:100%;text-align:center;height:650px;overflow:hidden;position:relative}.bannger_inbox{position:absolute;left:0%;top:0}.banner_pre_next{position:relative;z-index:105;top:306px;width:1200px;left:0%;height:37px;margin:auto;}.banner_pre_next a{width:37px;height:37px;background:url(../btn.png) no-repeat;text-indent:-999em}.banner_pre_next .banner_btn_left{position:absolute;left:-37px;background-position:0 0}.banner_pre_next .banner_btn_right{position:absolute;right:-37px;background-position:-37px 0}