.preloader-container:after {
    content: "";
    /* Create a pseudo-element */
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    /* Semi-transparent white overlay */
    z-index: 1;
    /* Place the overlay behind the preloader */
}

.preloader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 16px solid #3498db;
    border-top: 16px solid #f1c40f;
    border-radius: 50%;
    width: 80px;
    height: 80px;
    animation: spin 1s linear infinite;
    z-index: 2;
    /* Place the preloader on top of the overlay */
}

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

    100% {
        transform: rotate(360deg);
    }
}