.vnpay-checkout-form {
    display: inline-block;
}

.vnpay-button {
    background-color: #d0021b;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    padding: 12px 24px;
    font-size: 16px;
    cursor: pointer;
}

.vnpay-button:hover {
    background-color: #b00118;
}