.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.popup-content {
    background: white;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    max-width: 400px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

#close-popup-btn {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}

#close-popup-btn:hover {
    background-color: #0056b3;
}