#mf-payment-form {
    max-width: 400px;
    padding: 20px;
    background: #f8f8f8;
    border: 1px solid #ccc;
    border-radius: 10px;
}
#mf-payment-form input,
#mf-payment-form button {
    width: 100%;
    margin-bottom: 10px;
    padding: 8px;
}
#mf-payment-form label {
    font-weight: bold;
}