[rt-users] Overriding CSS in ticket display?

[Gary Oberbrunner]

 I have some tickets that have HTML (coming from email, which was pasted
from Word), so they have lots of <p class=MsoNormal>...</p> which RT
displays with a 1em margin, so they get really spaced out.  I can easily
fix that in main.css or ticket.css like this:

p.MsoNormal {
  margin: 0px 0px;
}

but how can I make that fix resist being overwritten by new versions of RT?

-- Gary Oberbrunner