.back-to-top{margin-bottom:env(safe-area-inset-bottom);margin-right:env(safe-area-inset-right);cursor:pointer;color:#fff;opacity:.8;z-index:10;background-color:#000;border-radius:50%;justify-content:center;align-items:center;width:50px;height:50px;font-size:32px;display:flex;position:fixed;bottom:30px;right:30px}