This looks very good! And it is very smart to offer all those people the opportunity to bundle all their poems or proza in an ebook.
Is it possible to extend the css for ebooks a little, just as it is customizable for the website? I know one can do this manually in for example the ebook editor of Calibre. (I tried this, and it works.) But it would be nice to be able to style the ebook a little more, so that it is automatically updated everytime the ebook is generated.