Responsive QR page

Thank you very much for your time to review my code, I will make sure to incorporate into my next solution.

Your solution is pretty good, just a few things I have noticed:

• Instead of using div elements, you could have used semantic tags for better accessibility (<article> for the card for example)
• You didn't have to wrap your card inside <div class="set-card-center">. The CSS properties of this class could have been added directly to the body.
• The image itself didn't have to be a flexbox. Just using a text-align: center on the card would have centered all the elements inside of it.
• Your card-body class doesn't have any CSS attributes, meaning this div probably isn't necessary at all. Just put the text inside the card, along with the image. To keep those texts under the image, add this line on your flexbox (body if you follow my advice, set-card-center otherwise): flex-direction: column;

Your result respects the design, which is already excellent! I'm just giving some advice to improve the quality of your code.