Custom Styling on Product Block Button

Hi!

I'm trying to move from some checkout buttons I made using links and button blocks to product blocks, which are much more reliable.

The problem is, I can't figure out how to change the stying of the button in each product block.

I'm trying to make the below button (my product block) look as similar as possible to the above block (my regular button block).

I have a basic knowledge of CSS, all I need to know is how to directly edit the style of the button and I can go from there!

Any help would be greatly appreciated.

Thanks, Albie

Can you share link to page where you use button? We can check easier