[Theme Penscratch] Increase the menu font size on penscratch theme

Hello everyone,

I am sorry to ask such a basic question, but I can’t firgure out how to increase my menu font-size – even after looking at different topics and trying different stuff. Also, I would like to reduce the space at the bottom of my menu (between the menu and the grey line).

I use a the penscratch theme. Here is my website https://www.thesofachronicle.com

Thank you a lot. I do appreciate.