Line Spacing in Navigation Pane / Indentation of Child Pages

I’m using the Vigilance theme, greatly modified, and I’d like to two things in the navigation bar. Would anyone care to give a greenhorn some pointers?

See the site here: https://www.ruleoflawrevolution.com

Two things:

1. Right now, the page links in the navigation bar on the right are almost double-spaced, and I’d like to get them way closer to single-spaced. Yes, I see the links are in boxes, so the boxes need to be made shorter (top to bottom).

2. I have five child pages that are indented under the page called “The Pledges”. I’d like to significantly increase their indentation, and perhaps even change the color of the font.

If anybody can toss a couple of hints my way, I’d sure appreciate it!

Thanks.

Jack