QR Code Challenge using html and css

Feedback welcome

Difficulties :

#My main challenge was the size of the div containing both the image and the text. Every single project i've been on, i struggle with that. I'm not sure how or when to use percentages , rem or pixels and how it will affect the images are involved.

#My second problem was the responsive aspect. I use the media querries to solve it but i'm still not conviced i couldn't do better or have cleaner code while making the page responsive.

Question: Was there a way to have the image fit in the div like in the design in a cleaner way ?