How can foreground and background colors be changed on Dash Home and Ubuntu software center pages?

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http://askubuntu.com – The problem with both of these is that the text is displayed in white letters on a very light grey background, and I have reached an age that I can't tell what's there. I would prefer either black text on white background, or white text on a black background. Running Ubuntu 12.04 LTS. (HowTos)