@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(360deg)}}.spinner-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.5);z-index:9999;display:none;justify-content:center;align-items:center}.spinner-overlay.show{display:flex}.spinner{width:50px;height:50px;border:5px solid #f3f3f3;border-top:5px solid #3498db;border-radius:50%;animation:spin 1s linear infinite}