I need to make the lines on my calendar darker.  Older people in the church
have a hard time determining where one date ends and another begins.  (I post
hard copies of the calendar so that people can sign up to reserve meeting
rooms even when I'm not here, and so that people who don't use a computer can
see what's coming up.)  I can't seem to find a way to just make the lines
black, instead of light gray.  There must be some simple way to do this,
surely.