Messages

I generally prefer using night mode to read, at least in other apps.  So far in using the ePub Reader, no matter how light a color I try to make the Foreground/letters, they are always so dark that they are unreadable if I successfully make the Background dark (and making the background dark has not been a problem).  So far I have only been reading one book, and I was wondering if there was a problem with that file, but it goes into night mode just fine when reading it in my iBooks program on my Mac, so I don't think it is a problem with the file.  I recently got a new Fire tablet and am looking for a good program for reading books in the epub format. So far the ePub Reader has the best overall features, except that night mode does not work right.  The best I seem to be able to do is leave the foreground/letters black and make the Background a dark yellow. I would much rather read in a true night mode, with the Background black and the letters offwhite.  If anyone can help me to make that happen I would really appreciate it. Thanks.