Responsive Web project #4 - Technical Documentation: feedback request

Would like feedback for this project! Cheers

Codepen here:

EDIT: I see the fcc demo page fails on the sidebar test for smaller devices as well… Nevermind about the rest of this post.

Guys, I am working on the Technical Documentation Page and would like your feedback on it, but also I am stuck on how to get the page to look correct on an iPhone (6S+). Right now I have a media query

@media screen and (max-width: 820px) {

but when on the 6S+ the test for the navbar on the left fails even though the page is displayed with the menu on the top. If it sees it as a smaller display, why is that test failing? (All the tests pass when viewing the page on a laptop).