.nav-tab-list .nav-tab-hover{width:100%;top:60px;height:50px;line-height:50px;background:#EAEDF4;position:absolute;box-sizing:content-box;z-index:1;transition:all 0.5s;-webkit-transition:all 0.5s;display:none;}.pren{margin-left:28px;width:900px;margin-top:10px;padding-bottom:20px;}