Font Help

Hi!  I was wanting my menu bar font and my blog post/page font to all match.  Jennifer helped to change my menu bar font at the beginning of the year, however it doesn’t match the font on the rest of my pages/posts.  Is there any way to change them so they all match?  I also feel that my menu font is a little too small and wanted help enlarging that too.  I tried to adjust these in my CSS however It didn’t change.  Thanks for helping!