i need Increase weight and heigt nav menue

First thanks for your Posts here.
Problem 1: i need Increase weight and heigt of my top navigation bar.My Site https://www.freshdeliexpress.com (HermesTemplate) I need to change the dimensiones of the Navigations Button bar for all Pages. Minimum doppel heigher.I see css.stylesheet and i see css.mainstylesheet and i dont understand which one is it an which code is to change.
Thanks a lot
Stefan

I'm not sure what you're asking. Your navigation bar (About Us, etc) looks fine to me.

stevesh:

I'm not sure what you're asking. Your navigation bar (About Us, etc) looks fine to me.

Thanks for your help
Ok, i dont want to change it. Thanks
i have a another questions, i need to put a deliver option in my Page, because i want that
the customer can select " weekly'' " every other week" for same delivery of our product.
have any idea if i can alternate my Template in this way?