I've spend some time searching for a modded apk, but I've been unable to find one. From what I've read it's possible to do. (h**p://www.droidforums.net/forum/droid-themes/42629-how-invert-colors-gmail-apk-message-display-screen-3.html)
I just think it will be much more easy on the eyes and battery life with a nice black screen like the default email app.
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