.product-back-btn{position:fixed;left:15px;bottom:80px;z-index:998;width:40px;height:40px;line-height:40px;background:#000;color:#fff;border-radius:50%;border:none;cursor:pointer;display:flex;display:none;align-items:center;justify-content:center;font-size:18px;font-weight:700}@media (max-width:768px){.product-back-btn{display:flex}.scroll-up-btn{right:15px!important;bottom:70px!important}}