.overlay {position: fixed;z-index: 9999;top: 0;left: 0;width: 100%;height: 100%;background-color: rgba(255, 255, 255, 0.7);display: flex;justify-content: center;align-items: center;}
.loader {border: 16px solid #f3f3f3;border-top: 16px solid #3498db;border-radius: 50%;width: 40px;height: 40px;animation: spin 2s linear infinite;}
@keyframes spin {0% {transform: rotate(0deg);}100% {transform: rotate(360deg);}}