[gedit-list] Changing the colour of the right margin

[jeremy Ruten <jeremy ruten gmail com>]

How is the colour of the right margin determined? My monitor's a bit
bright and I can't see the margin it's so bright. I'm lost without an
80-char margin, I feel like I'm walking off the boat. It seems to
depend on the gtksourceview style file. Anyone know how to do this?

Thanks,
jeremy