First thank you folks for this great content type. It works really great on Desktop. On the mobiles there are some issues: Sometimes it breaks the lines or shows the lines not complete. Then it makes the font bigger. Screenshot is from Galaxy J4+, but it´s the same or even worse on Moto C. And it seems it´s like that on more mobiles. I guess many people would like to do it on mobile, and it would be great, if it would work on most mobiles too.
Wordpress 5.2.2 Gutenberg