body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    color: #fff;
    padding: 20px;
    text-align: center;
    z-index: 9999;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.popup a {
    color: #14A3C7;
    text-decoration: underline;
}

.popup .btn {
    background-color: #21ab64;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    margin-top: 10px;
    font-size: 16px;
}

.popup .btn:hover {
    background-color: #45a049;
}