Responsive QR code page using Flexbox CSS

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

I am very much a newbie, as far as web frontend development goes I have just started my journey and decided to use this challenge as starting point for practicing web development. I wanted to practice:

• Semantic HTML
• CSS code organisation using BEM
• Code reusability and maintainability by leveraging CSS custom properties

Please provide me with any feedback that will help me improve in the areas listed above.

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

This challenge was simple enough to implement.

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

Any comments on how to make better use of semantic HTML and applying coding standards to CSS would be greatly appreciated