Am I wrong? It looks like this set of instructions means one also has to change the CSS in every single one of their ePub books?
That would be 350+ ePubs in my case -- prohibitive.
Similarly, Jack's process has the same "must open every ePub file for changes", if I'm not mistaken. I was REALLY hoping for a "one-time" solution.
@JSWolf, wow, thanks for the clarification. I didn't see anything in that guide to indicate that it wouldn't work for epubs, so... thank you for the clarification.