Adjsuting the post textbox’s width

Hi I’m using this plugin that “improves” the WYSIWYG editor by adding new features to make it look a lot like the standard MS Word tool bar. Unfortunately due to the extra icons, the floating side widgets on the right are already hovering above the text box. Whenever I get to that part, I could no longer read the text. Is there anyway to adjust (decrease) the text box’s width so that it would stay clear of the widgets?

Thanks