Editing text in a scrolling DIV?

i have a site made up of DIV text boxes, with their OVERFLOW set to SCROLL. the text is black on a light blue background, but the page has a very dark brown background.

when i go to edit the page in Contribute, i can edit the text in the box, but the text that overflows spills down over top of the dark background, making it impossible to read/edit/scroll down to. does anyone have any ideas how i can edit ALL of the text in that DIV?

the site in question is www.alexnussbaum.com