Many thanks, happy that you are enjoying it!
Leanpub allows you to customize the theme. Given the amount of code in the book and the book’s length, I opted for a smaller font, so that code listings and IEx snippets fit better on the page. Do you find it uncomfortable for the eyes? Let me know and I can adjust in the next release (on Leanpub and PragProg).
Edit: forgot to mention that I’m in the process of porting Northwind Elixir Traders to Asciidoctor, so that I can be more flexible with formatting of the generated PDF and ePub files (that will eventually end up on both Leanpub and PragProg).
