.popup-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}
.popup {
    background-color: #fff;
    padding: 20px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 0 10px rgba(0,0,0,0.3);
}
.popup button {
    margin-top: 15px;
    padding: 8px 16px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}