Giving some paragraphs a background colour with DITA

[rebecca officer]

Hi everyone

We're going to be using FrameMaker (12) to output PDFs from DITA. We'd like certain paragraphs and/or table cells to have a background colour. 
 
Our specific usecase is that we produce multi-switch config examples. Sometimes, we find that each switch's content takes up more than a page, and that all the switches are nearly identical. It really helps if we can colour the content differently, so users (and us!) can see whether they're on switch 1, 2 or 3.
 
We thought maybe outputclass would let us do this, but so far we haven't figured out how. We've found online references to doing this with the open toolkit, and for HTML with CSS, but nothing about Framemaker.
 
Is there a way to use the outputclass attribute to style how some elements appear in FrameMaker? If not, is there another way to get the effect we're after?
 
Thanks very much!
Rebecca

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