How do I customize my buy button in Cart CSS?

Hi ya all! I got acouple of confusing buttons (attached) in my cart which causes a lot of abandoned carts for me and i need to replace these with a clearer set of buttons labelled as " The buttons i want" in the attachment. The buttons i want have this code:

Code IS Cart CSS.docx (17.6 KB) The Button i need
I also attached the current CSS code i have - can you be kind enough to give me any tips with how this needs to change to get the buttons i need replacing the current ones?

Edit CSS in order form and/or Shopping Cart theme section: