Responsive Order Summary Component with HTML and CSS by Using BEM

What are you most proud of, and what would you do differently next time?

I am happy with the result and I think I have understood the BEM methodology. Next time, I would like to go further by using modifiers, but I don't know yet how to proceed at this stage.

What challenges did you encounter, and how did you overcome them?

Nothing comes to mind.

What specific areas of your project would you like help with?

Suggestions are welcome. I call upon the masters of the BEM methodology to give me their opinion on how I have utilized it.