Automatically add extra space between category listings

Hi. I have a Directory Press 7.0 site called http://www.iowamade.net with a little over 100 category offerings to date. I’m looking for an easy way to have the site automatically add an extra space between each of the subcategories.

As you can see on the homepage, the spacing is fairly tight between the individual listings under the “All Categories” banner (e.g., under “Art” you see “Drawing/Painting/Illustration Glass Metal Mixed Media Paper Photography Portraits Pottery Prints Sculpture Stained Glass Stone Wood.” Those represent the first subgroup of subcategories. I think a double-space instead of single-space look would really help.

Let me know if you have any questions — or if I should direct this specifically toward the DirectoryPress users out there.
Best,
C.J.