.back-to-top{cursor:pointer;z-index:999;background:0 0;border:none;width:60px;height:60px;padding:0;position:fixed;bottom:200px;right:37px}.back-to-top img{object-fit:contain;width:100%;height:100%;transition:transform .25s,opacity .25s;display:block}.back-to-top:hover img{transform:translateY(-4px)scale(1.05)}.back-to-top:active img{transform:scale(.95)}@media (width<=576px){.back-to-top{width:42px;height:42px;bottom:16px;right:16px}}