QR code challenge using Flexbox

Getting the footer to stick to the bottom and independent of the flexbox was the biggest challenge for me. Hoping I did that right. Not sure I did the best sizing with the QR image. I'm thinking there should be a way to keep the same aspect ratio. Please comment if you have a better way...but I will look at solutions online. Also, struggled with getting it to work with mobile sizing. I used @media and build for desktop 1st. Really enjoyed doing this and anxious to get feedback, review solutions and move onto more challenges. Thanks!