#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.7);
    z-index: 9999;
    display: none;
}

.loader {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    border: 4px solid #ccc;
    border-top: 4px solid #2563EB;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    100% {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}