QR code Component using HTML and CSS

So this project was fun to do because I went back to HTML and CSS, to the basics. It challenged me but in a good way. It got me thinking and looking for every detail.

I had some trouble positioning the QR image, but eventually, by trying different approaches, I reached a point where I was satisfied with how it looked.

I would definitely appreciate any tips on how to create a visually appealing (best practices) CSS document, as I don't think mine was perfect. I used SASS complier before but that was for one project. Should I focus more on SASS?