Indeed, that seems to be part of the default styles.
https://github.com/koreader/koreader...lib/cr3.css#L2
You would overwrite that by also adding:
Code:
p {text-indent:0 !important;}
Indenting the first paragraph strikes me as somewhat questionable typographically because it's superfluous. The purpose of the indent is to set it apart from what precedes.
Some people prefer consistency and to indent everything, but I'd wager 90% of my books don't.