Is there any way to make the site navigation bar thinner- adjust the height?

The line-height that is set on #access a appears in 2 spots in your style.css file (line 42 and 566), both with values of 3.333em. Reduce the value on one of them and delete the other. I would actually delete the entirety of #access a on line 566 as it is not being used.

Perfect! Thanks so much! Someone else mentioned that I have duplicate #access a lines but I don’t see it (I’m editing the child theme in wordpress). I did edit the em amount and it worked though! Thanks!

Just took another quick look and the stuff from line 42 is from the stylesheet in your child theme, and line 566 is from twentyeleven. The values in your child theme css that match those of the parent theme are unnecessary, so you could delete them and they’ll be used from the parent, reducing the overall size of the css file.