Responsive QR Code component styled based on jpg desig, using pure CSS

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

There's two main things that I'd like feedback on:

1. I tried to complete the challenge using only the JPG design files as a guide, so I had to eyeball sizes, borders, shadows and such. Did I kinda get it right? If not, is it too noticeable or would it be fine?

2. I also kept the CSS file as organized as I could. This was a very small project and I'm planning on using Tailwind whenever possible, but I still would like some suggestions on how to organize raw CSS files in the future.