This looks well done! All I have noticed is that the mobile view is not centered like the desktop view is. I noticed that your desktop view has a top margin added to bring it down from the top of the screen, while your mobile view lacks that. It may also be related to the total height of the viewport, as the box containing your card is only as big as the card within it. I would suggest either adding more margin to your mobile view, or adding size to your body element.
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