.loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loader-box {
    text-align: center;
    color: white;
}

.spinner {
    border: 6px solid #f3f3f3;
    border-top: 6px solid #3498db;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

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

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

/*.a1 {
    display: inline-block;
    padding: 12px 20px;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-size: 16px;
    margin-top: 50px;
}

    a:hover {
        background-color: #2980b9;
    }
*/
.center {
    text-align: center;
    margin-top: 100px;
}