QR Code Component Challenge using HTML and CSS

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

Putting my HTML and CSS knowledge to use and closely replicating the QR Code Component in a concise way.

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

Ensuring a responsive design in the implementation, therefore using the Google Chrome Developer Tools viewport gadget to check for good responsiveness.

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

Nothing in particular, however any feedback is appreciated.