Originally Posted by amuzulo
It has no DRM on it, but how can I edit the CSS? Whenever I try to open an ePub file in a text editor, I just see garbage.
ePUB files are just zip files. Unzip it with Winzip or similar and you'll see the contents. When zipping back the files (if you do that) the only thing you have to consider is that the "mimetype" file has to be first in the archive, and stored with no compression.