How do I modify formatting for [eab_archive] pages?

Hi,

Thanks to the changes in the Events plugin, I am now able to use [eab_archive] to display all events for a given category:

http://yoga4arthritis.com/training-events/

However, the standard formatting leaves rooom for improvement, so I'm looking for help on how I can add additional spacing, moving the horizontal line so that it comes between events, etc.

Thanks in advance,

Robert Ford