#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(70, 70, 70, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

#loader {
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 1;
    width: 120px;
    height: 120px;
    margin: -76px 0 0 -76px;
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid #3498db;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
}

#loading-message {
    position: absolute;
    top: calc(50% + 70px);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    font-family: Arial, sans-serif;
    color: #fff;
    font-size: 16px;
    width: 100%;
    z-index: 2;
}

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

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