Changing Font Sizes

Hello community,

I could use help with the following:

How can I make the price shown on my main shop page (where all products are shown) larger? When I click into the product the price font size is fine but on the main shop page its really small.

The Add to Cart button is also obnoxiously large. Can this be reduced?

Lastly, is it possible to make the View Full Item button bigger and a different font?

Pics attached. 

Can you share link to page? We can check problem easier