Hi @PamCotton and @TS5 I can confirm that there isn’t currently a system template that can be customized for the one-time use password page.
I suggest adding an idea here to request this feature from the product team.
I would include a screenshot of the page (the link you provided isn’t a live link and won’t help provide context for others to know what you’re referring to) and what you’d like to be able to customize on the page.