Responsive Data Storage Component - Mobile-First, Flexbox

Originally I completed this as desktop-first, but upon suggestion went back and converted it to mobile-first - something which I've never done. Hopefully there's no goofiness, but please let me know if you find anything!

Has anyone managed to implement a meter or progress element? I tried my hardest, but couldn't quite get the styling right for either and had some major cross-browser compatibility issues. Firefox was the only one I could get to display somewhat close to the design.

Edit: For clarity - because I couldn't get either meter or progress elements to work, I ended up just going the plain old div route. 😅 Just wondering if it's possible!