QR code component using Flexbox

Is there a box shadow around the white box?? I continually struggled determining if there was one at all cause there seems to be something faintly there, but I couldn't figure out the correct configuration to match it.

How do you recommend adding the attribution? I thought it would be simple to add it after I finished the challenge, but then it threw everything off. I had to create an additional main section to wrap the flexbox of the white box, just so I could have a footer outside of it, but even then it took some positioning to try to get it somewhere.