Problem with the sidebar side

Hi.
I'm Italian, sorry for my English.
I should decrease the width of the sidebar side.
Already I was able to move the text and horizontal dividing lines in tab.css and wide.css, but I can not move the vertical lines to change the sidebar side.
How can I do?
Looking to buy the template, but I want to be sure we can solve the problem.
The blog site is www.inet1.altervista.org
Thank you!