.up--visible{display:none}.back-to-top{width:50px;height:100vh;position:fixed;left:0;top:0;background:rgba(144,144,144,0.1) url(/assets/footer/desktop/back-to-top/main/i/arr.svg) 50% 50% no-repeat;display:none;transition:background 0.4s;cursor:pointer;z-index:100;background-size:16px 55px}.back-to-top:hover{background-color:rgba(144,144,144,1)}.back-to-top--visible{display:block}@media(max-width:1530px){.back-to-top{width:40px}}