Ability to use custom components

I get that the idea of this project was to quickly and easily have UI with minimal effort. However, the email & password UI does not match the theme of my website (text fields, labels etc). The CTA to initiate an email & password is good. Would it be possible to have the ability to use a custom component rendered instead?

Start by reviewing how the React wrapper exposes and renders the email and password UI, then determine what part of the existing flow must remain while allowing custom components. Done means users can replace the themed fields and labels without losing the email/password CTA flow; the issue names no files or tests.

Written by the indexing model from the issue text.