Styling RT (CSS)

Hello all,

I am trying to modify the web2 RT UI/interface (I created a new style
by copying the relevant files into a new directory). In particular, I
want to remove the background colour alternation, and instead replace
it with one colour for all the metadata/metainfo, one colour for
comments, and one colour for correspondence. The first part is easy
since there is a .metadata class attached to these elements. However,
both comments and correspondence have the same identification
(classes .content > .messagebody). From what I can tell, this makes it
difficult to style them differently. Am I missing something?

I am running RT 3.8.4.

Thank you,