header a img {
    max-height: 50px;
}

#payu-payment-form button[type=submit]{
    border: 0px;
    height: 50px;
    width: 290px;
    background: url('http://static.payu.com/pl/standard/partners/buttons/payu_account_button_long_03.png') no-repeat;
    cursor: pointer;
}