.up-button{background-color:#383434b3;width:80px;height:80px;border-radius:50%;color:#fff;text-align:center;cursor:pointer;position:fixed;bottom:-18px;right:18px;transition:.4s linear;opacity:0;z-index:10}.up-button-active{opacity:1;bottom:18px;transition:.4s linear}.arrow{font-size:30px;display:flex;text-align:center;justify-content:center}