Make right sidebar smaller/thinner

Hi!

I’ve got the Hudson theme running and it works great. But the right sidebar is a little to big and I’d like to figure out how to make the sidebar smaller / thinner so there’s more room for content.

Any ideas on how to do this? I’ve managed to learn a few things here in the forums that have allowed me to make a few changes but the sidebar seems to be coded in another way that doesn’t match the examples I’ve found.

You can see the site here: http://mindoff.se/blogg/

Thankful for any help.