A Responsive QR code component which include both desktop and mobile

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

I learnt how to make use of the object-fit attributes in css to scale an object to fill it's parent element, which i found difficult to achieve initially.

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

How to make an image fit well in its parent element, while maintaining its aspect ration.