I don't know how to decrease the padding between 3 html blocks I put into a sidebard widget

My website is starting to look good, thanks to some support I got from you guys, but I'm still having a last challenge.

I don't know how to decrease the padding between the directory, join, advertise and renew buttons I put in the "homepage widget area". Can you help?

http://www.mahopaconline.com
The support dashboard is installed, and I believe that it's still open for access from tech.