Alright I’ve found a way to fixing both of my problems but I am not really happy with the solution.
The issue around the centering of my button required only a little CSS love to solve it but I am not particularly happy with the solution I found for the message.
Before I created a RichText with a div container and p childs as Zac shows us in the videos, but this didn’t let me use che titleBoxColor attribute I had. So the solution I found was to transform the div into a p and now I am able to see correctly the color.
But I would like to understand why before wasn’t possible even if the dev tools of my browser said different:
Thank you for the future help.