Vertical Line on Page/CSS edit

Hi,

I am trying to add a vertical division line between my two columns of code.

When I add the HTML code that creates the visual representation I have this issue:

http://pruf.us/test/?preview=true&preview_id=15&preview_nonce=9ec15d6dc5

I am aware that there is an edit option in the CSS stylesheet to fix this problem, however I cannot find it. Perhaps I am not aware of something with this theme.

Any help would be appreciated.

H