"Newreply" "NewThread" box is offset - how to center?

[PnL]

When I click on "NewThread" or "NewReply" the message box, which includes the title, message and smilie box (enabled in my case) are offset from the center. In this case, depending on the smilies which appear in the smilie box, the smilie box gets cut-off by the border of the forums.

How do I control how to center this? There is plenty of room on the left side and I'd like to be able to move it over.

Any suggestions on where this is? I've looked at the newthread and newreply templates but didn't find anything there.

Thanks,
Paul