Responsive order summary component html css

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

I am proud of doing readable and understandable code. I used BEM Methodology for naming block.

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

Small challenge was with margins in flexbox block_subscription. I delete them and used flex-grow.

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

Did I use BEM correctly? If no, what should I change? How about responsiveness? Does it readable for you? If no, please, share you opinion!

Any feedbacks are important! :)