Is there a way to increase the size of the avatars?

This shortcode: [vauthors_page roles=”administrator,author” counter=”%post%” bio avatar border]
produces a visually pleasing page EXCEPT that the avatars (images) of my authors are too small. Here’s the page I’m using to test the plugon: https://settingforth.org/?page_id=7101. (If you look at the page, you’ll notice that paragraphs in the bio are spaced too far apart; I can fix this when I replace my current display-all-authors page with this one, so don’t worry about that.)

Another problem as well: Authors who have been entered into the system but who do not as yet have published posts are showing up with zeroes as their number of published posts. This in itself would keep my from using this plugon since it would be too much trouble to individually list the IDs of these authors as exceptions to list, and then remove them from the exceptions list as soon as the post that is in progress is published.