Hi,
I'm not sure where I got the shadow on the QR code in all honesty lol. I put one on my solution but I think I meant to put it on the whole card itself. Looking at it now, there seems to be a subtle shadow at the bottom of the card, so it looks as if it is raised from the page slightly.
Either way, it's just one of these: https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow
If you Google 'css box shadow' there are websites which allow you to visually tweak a box shadow and then copy paste the css over.
Sorry for the confusion.
For the centring, I was doing this:
body { height: 100vh; display: flex; align-items: center; justify-content: center; }
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