.screen-curtain {
    position: fixed;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9999;
}

.spinner_off {
    position: absolute;
    z-index: 8000;
    top: 30%;
    left: 50%;
    display: none;
}

.spinner_on {
    position: absolute;
    z-index: 10000;
    top: 30%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%);
}

.spinner {
    border: 16px solid #f3f3f3;
    /* Light grey */
    border-top: 16px solid #3498db;
    /* Blue */
    /*	background-color: #1e4b89; */
    border-radius: 50%;
    width: 120px;
    height: 120px;
    animation: spin 2s linear infinite;
}

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

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