Editing: Add spaces to one section of homepage

There’s one particular section in the middle of my home page (titled “ALL CATEGORIES”) in which every category and subcategory of my directory is listed. It starts with the ART category and continues with several subcategories (Drawing/Painting/Illustration, Glass, Metal, etc.) under that section.

It’s those subcategory titles that are too close together. I’m wondering if there’s an easy way in Edit to automatically add a space. Can I edit the CSS for this one particular section of the homepage? And if so, where do I go?

The website, by the way: http://www.iowamade.net

Thank you in advance for any suggestions! Craig