#payment-form {
    max-width: 400px;
    margin: 0 auto;
}
#payment-form input {
    width: 100%;
    margin-bottom: 10px;
    padding: 10px;
}
#payment-form button {
    background-color: #0073aa;
    color: white;
    padding: 10px;
    border: none;
    cursor: pointer;
}