change font size of product title and product short description on category page

I would like some more advice please on adjusting specific text sizes.

1. In backend under Typography I can set font name, colour and boldness but not size! Is it’s size set somewhere else? Weird that I can’t change it. I think it’s too small on the category page – especially if I use the option to have hover show short description as that text is bigger than product title.
Can you please tell me how to make this text bigger – perhaps using Advanced Typography?

2. In backend under Typography I have set text size to 16px which is what I generally want except for the Product Short Description when it shows on hover, I’d like that text to be smaller if possible. But on Single Product Page, I want Product Short Description to stay at 16px.
Is there a way to change the size of Product Short Description text just on hover?