Thanks Kris and wacoh_327 for your speedy responses, both solutions worked perfectly.
Quick question for wacoh_327, I have the CSS stylsheet editor that just automatically installed with Jetpack. Is the Custom CSS Manager that you suggest a better choice?
However, is there a way for me to remove the padding now? The borders are gone but the posts are still indented towards the right (leaving room for the now non-existent border). I’d really like for all of it to be aligned on the left.
Thanks again!
Sam