Where did my navbar go?

When making the screen smaller my navbar disappears. I’ve noticed when removed the fixed position from my n <nav> it reappears, but that causes a test to fail. Can anyone explain what is causing this and how to fix it? Thank you.

Also, when hovering on my projects the image overlaps the navbar.

https://codepen.io/aetones/pen/yLeLQpM?editors=1100

For the hovering issue, adding a z-axis to the navbar will fix that. As for the disappearance, I didn’t fail any tests after removing the fixed position from nav (or adding it to navbar, for that matter). My guess is something with default processing in CSS or Codepen for collapsing navbars but I can’t offer you much help.

Thanks for the suggestion.