#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    }

    .spinner {
    width: 50px;
    height: 50px;
    border: 6px solid #ddd;
    border-top-color: #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    }

    @keyframes spin {
    to { transform: rotate(360deg); }
    }