.modal {
    display: block; /* Show the popup */
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.9); /* White background */
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 4px 15px rgba(0, 0, 0, 0.1);
    z-index: 9999;
}