Adding CSS to make shop button bigger

Hi all,

The goal here is to see if anybody could give me some code to insert that would make my shop buttons bigger. Im using Gantry5 but I would assume i could just add some CSS to the ‘Additional CSS’ under the theme’s customize button. I know a little code but not enough to know how to do this. I know if I add padding it will make the box bigger but the string of code im looking for is outside my vocabulary

The page I need help with: [log in to see the link]