3-Column Card Component Built Using Flexbox

My biggest difficulty in this project was the mobile view. I have yet to get in the habit of a mobile-first methodology. One thing that slowed my progress was Sass. I was unaware of how the nesting of items would affect how I needed to write my media query as well. This has caused me to learn that I should generally avoid nesting unless I have a reason to.

Like my QR Code Component solution, I relied heavily on Flexbox to achieve my result. I feel I applied it too much (body, main, and container class) given the project size. While I'm happy with the result, I'm worried about developing bad habits.