Change existing card payment input fields to a more appealing UI

Currently have a card payment page which has the card input fields been put in which are generic placeholders.
No thought was taken when putting these in place, they do not follow the theme of my website or colours, thus a user may feel they are not on my website when making payments.
So a simple quick change of UI to make the card input fields more in line with my website.
Attached image shows what is in place currently, I have a nice website template which has input fields and buttons far nicer, so merely use my templates codes and ensure working once completed.