How to adjust `font-size` of comments?

[hirrolot]

I use Utterances for my personal blog. It is really an unfortunate thing that I can't just adjust comments' font-size with the text of a blog post.

I tried the onload event for iframe, but due to lazy loading, this doesn't work at all. I don't need fancy CSS styling, I just need to adjust the font size. I couldn't do that even with numerous dirty hacks that I've tried.

If someone faced the same problem, I would be grateful for a workaround.

Related: https://github.com/utterance/utterances/issues/367.