FrameMarket: Reducing font sizes

Hello WPMU Dev Support,

I am using the FrameMarket/GridMarket themes on domain

Various patches of code have been provided to me to reduce the font sizes, I now need to reduce the font sizes for:

1) The menu

2) The Product Lists that are in the footer/bottom of the page on

3) How do I reduce the font size for the whole website, I think this is the Typography setting that would be in the .css file, I would like to get full control of the font sizes and set them as I need.

Kind regards,