Font Size on "Older Entries" / "Newer Entries" at bottom

Hi! I’m trying to customize Origami Theme on my blog, and I want to change
the font size and style of the nav at the bottom that says “Older
Entries, Newer Entries”. Love the look of the theme but I feel like
this type is too small and gets lost so people may not know how to get
to older posts.And its confirmed, over the weekend a number of people told me that they only thought there were a few posts.

For the life of me, can’t find where to do this in the css. Can you
help me?

Thanks!
Lissi