.loading-spinner{border:5px solid #f3f3f3;border-top-color:#3498db;border-radius:50%;width:50px;height:50px;margin:20px auto;animation:1s linear infinite spin}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media screen and (display-mode:standalone){.loading-spinner{margin-top:env(safe-area-inset-top)}}