.content_sider{height:auto;position:sticky;top:40px}.product_item{border:1px solid #f7f7f7;box-sizing:content-box;padding:4px 16px;transition:all .3s linear}.product_item:hover{border:1px solid #fff;box-shadow:4px 4px 20px #0000000f}.active{background-color:#0087d0;border-radius:2px;color:#fff}