border

hi,

I recently installed and modified acquia slate theme onto my site and I absolutely love it.
I just have one thing that bothers me. Unlike the left sidebar, I see that right sidebar doesn't have borders which makes it look very disorganized. I want to know how I can enable the border for the right sidebar.

for your info, my site is: http://www.roflegion.com

Thank you,
Kelvin