OK! Got it.
I worked with Word for over 20 years and when converting to epub it is very good. However, I'm just trying to use Pages and suck up all the skills I need. The option to "Export in epub" is a drop of honey at work, BEYOND for those who have a 121-gigabyte Macbook Air just because using Word that consumes me 2.0 Gb if Pages only 300k?
But I thank all of you who taught me something above. I can read on Android without that shadow of the image using the tip that VikingOSX passed. If I read in the "Apple Book" I can put the color that I want that is 100%, but when I go to Android I get 100% ONLY WITH THE WHITE COLOR that is no longer suitable for long readings.
Thank you all.