body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 20px;
}

.call-popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    text-align: center;
}

.call-popup button {
    margin: 10px;
    padding: 10px;
    cursor: pointer;
}