thefonebug
Charles asked for a document and you posted a screen capture. We can see the pink area on the page but we can't tell you what it is without examining the document. We might have had a fighting chance if you revealed all the hidden characters before doing your screenshot but you didn't even do that.
It sounds like you have a style with a background shading applied to it but we can't diagnose it from a screen capture.

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Andrew Lockton
Chrysalis Design, Melbourne Australia