#back2top{position:fixed;right:1rem;bottom:1.5rem;display:none;padding:.6rem .7rem;border-radius:.75rem;background:var(--md-primary-fg-color);color:#fff;font-size:.9rem;box-shadow:0 6px 18px rgba(0,0,0,.18);cursor:pointer;z-index:999}#back2top:hover{opacity:.85}