#loadingOverlay {
    display: none; /* hidden by default */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 9999;
    text-align: center;
    color: #fff;
    font-size: 18px;
    padding-top: 20%;
}

.spinner {
    border: 6px solid #f3f3f3;
    border-top: 6px solid #ffcc00; /* golden yellow */
    border-radius: 50%;
    width: 60px;
    height: 60px;
    margin: 0 auto 20px auto;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg);}
    100% { transform: rotate(360deg);}
}