.spinner{display:inline-block;border:2px solid rgba(255,255,255,0.3);border-top:2px solid #fff;border-radius:50%;width:16px;height:16px;animation:spin 1s linear infinite;margin-left:8px}@keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}.spinner.hidden{display:none}