After my first go at this assessment failed. I took a hint from @dylan.gonzalez and reviewed the material on Flexbox, Grids, and Media Queries. Definitely the reason I had a better second round on this one.
Please review via GitHub (CSS) - Any recommendations are appreciated, regardless of how minor. And the actual site via GitHub pages.
The only CSS changed outside of the media queries was formatting.
Great job setting up the lessons and assessment, MDN and @chrisdavidmills!