.back-to-top{position:fixed;bottom:15vh;left:50%;z-index:100;width:100%;padding-right:var(--s-lg);text-align:right;visibility:hidden;opacity:0;transition:opacity 300ms ease-in-out;transform:translateX(-50%)}@media(min-width:768px){.back-to-top{padding-right:var(--s-4xl)}}.back-to-top.is-visible{visibility:visible;opacity:1}