.page_banner{background:url("../images/about_banner.jpg") no-repeat center center}.exhibition_list li{width:380px;margin:0 10px 20px;box-sizing:border-box;border:1px solid #b9b9b9}.exhibition_list li:hover{border-color:#1648b9}.exhibition_list .imgs_box{width:378px;height:327px}.exhibition_list .imgs_box img{max-width:378px;max-height:327px}.page_detial{background:#fff}