Thanks guys - however, I think I'm gonna give it a break and just focus on reading the books. I've opened some EPUB and KEPUB books in the editor, and can't find the information relating to the font size. The thing is all the EPUB's (I use for novels) I have have similar font size, the KEPUB's (historical books with footnotes and pictures) are much smaller. Think I could add the values GeoffR mentioned, but never really studied HTML code.
@GeoffR - unless could you show me a sample of how you add specific info on the font size the books should use, e.g. small/medium size for main body? If that's an issue though, don't bother, thanks anyway.
EDIT: I have opened an EPUB in the editor once more, and, correct me if I'm wrong, the
main font used in the novel is defined by the parameters in
calibre1 which are
here. Does it mean it will suffice to add the information on the font size here, e.g.
font-size: small? If I use zero value, will the reader apply its default settings (if such exist)?