.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    /* Semi-transparent background */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9998;
    /* Ensure it is above other elements */
    display: none;
    /* Hide by default */
}

.loader {
    border: 13px solid #f3f3f3;
    border-radius: 50%;
    border-top: 13px solid #000000;
    width: 70px;
    height: 70px;
    -webkit-animation: spin 2s linear infinite;
    /* Safari */
    animation: spin 2s linear infinite;
}

/* Safari */
@-webkit-keyframes spin {
    0% {
        -webkit-transform: rotate(0deg);
    }

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

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

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