.back-to-top{position:fixed;z-index:120;right:22px;bottom:22px;width:48px;height:48px;border:0;border-radius:50%;color:#fff;background:#2f7de4;box-shadow:0 8px 25px rgba(15,50,100,.28);font-size:24px;cursor:pointer;opacity:0;pointer-events:none;transform:translateY(10px);transition:.2s}.back-to-top.is-visible{opacity:1;pointer-events:auto;transform:none}@media(max-width:650px){.back-to-top{right:15px;bottom:15px;width:44px;height:44px}}