Be able to set padding and font size of “Product Button”

It would be great if one could modify the padding size around the button text, to make the button appear larger.

See my opencart website as an example of a “Product Button” with a generous amount of padding around the text. This helps the button stand out more. Being able to adjust font size would also be really nice.
https://www.allyshoes.co.za/index.php?route=product/product&path=71&product_id=21759