title_body: Centering images in ePub made with Apple Pages
upvoted_answer: The right alignment results from the margin-left:16.5528% in the span surrounding the image. I am not sure if you can change that in Apple Pages. 
  I would experiment with Position (at the bottom of your screen) essentially
  there should be no position in cm associated to something centered, as you
  cannot know (in an ePub) the width of the page up-front.
  
  If you cannot switch that off, you can resort to cleaning the epub with a script, this seems easy enough to find (e.g. using CSS locater span &gt; img and changing the style on the parent of that img)