#passengerForm {
    max-width: 600px;
    margin: 20px auto;
    border: 1px solid #ccc;
    padding: 15px;
    background-color: #f9f9f9;
}
#passengerForm fieldset {
    margin-bottom: 10px;
    border: 1px solid #ddd;
    padding: 10px;
}
#passengerForm label {
    display: block;
    margin-top: 5px;
}
#passengerForm input,
#passengerForm select {
    width: 100%;
    padding: 5px;
    margin-bottom: 5px;
}