.page_banner{background:url("../images/banner/case_banner.jpg") no-repeat center}.case_list{width:1250px;margin:0 auto;padding-top:20px;text-align:center}.case_list li{width:400px;margin-top:25px}.case_list li:not(:nth-child(3n)){margin-right:25px}.case_list li:hover .case_info{height:100%}.case_list .img_box{width:400px;height:320px}.case_info{position:absolute;left:0;right:0;bottom:0;z-index:2;background:rgba(0,0,0,0.6);height:50px;-webkit-transition:height .5s linear;-moz-transition:height .5s linear;-o-transition:height .5s linear;-ms-transition:height .5s linear;transition:height .5s linear}.case_info h3{width:100%;box-sizing:border-box;padding:0 20px;line-height:50px;height:50px;color:#fff}