[SOLVED] adding border in place of using sidebar

Hi guys!

I'm using version 3.7.9.

I have left and right sidebars activated but I disabled right sidebar in one single page
u can check it here: http://ec2-54-246-43-184.eu-west-1.c...ibersol/saude/

but now seems the page doens't "end" if u know what I mean....Is there any way to add a border or something like that to mark out the right limit of the page???

thank you!