Actually, the way most people do it is to make the text of the warnings white and also highlight those words white, so the background of the page doesn't matter. I guess you could make the warnings any color you wanted, as long as you made the highlight color match. I don't know the code for that offhand, but I've seen it posted in a lot of places. :-)
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Date: 2011-04-02 03:58 pm (UTC)