.adv_list_li_new{width:300px}.ybjz_case{padding:47px 0;width:1200px;margin:0 auto;margin-bottom:50px}.ybjz_case_ul{float:left;width:1200px;height:540px}.ybjz_case_li{position:relative;float:left;width:300px;height:540px;cursor:pointer}.ybjz_case_img{width:300px;height:540px}.ybjz_case_lihover{display:none;position:absolute;width:300px;height:540px;background:rgba(0,0,0,.4);top:0;left:0;border-radius:20px;text-align:center}.ybjz_case_lihover_img{width:150px;height:150px;margin-top:200px}.ybjz_case_li:hover .ybjz_case_lihover{display:block}