Mobile-First Responsive Result Summary

1. Difficult: of course, responsiveness, as I am out of touch for some time, so need to revise a few things now onwards.

2. Unsure: I completed this challenge in VSCode, and it is working fine (except for some colors suggested in style-guide, you can see screenshots). But when I uploaded the same website to github the formatting is gone. Not sure what's the problem, I may give it some time tomorrow to search for solution or cause of problem.

3. Best Practices: What's the best sizing practice for response web design (as I messed up everything while trying rem, em, and %, then went back to px. And if you can add something to the problem I faced in number 2 above about code in VSCode vs Github.

Regards