#oos-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    padding: 20px;
    border: 1px solid #ccc;
    z-index: 9999;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    max-width: 90%;
    width: 400px;
}

#oos-popup h2 {
    margin-top: 0;
}

#oos-popup ul {
    list-style: none;
    padding: 0;
}

#oos-popup ul li {
    margin-bottom: 10px;
}

#oos-popup ul li a {
    text-decoration: none;
    color: #0073aa;
}

#oos-popup-close {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #333;
}

#oos-popup-close:hover {
    color: #f00;
}