This reverts commit 3119b881aa6c297e3fdb281188a1d1b9a5fcd349.
This caused the nav bar to sometimes show up in the middle of the viewport. I believe this is because we use
-$footer-nav-height in this file. That translates to
-var(--footer-nav-height) in the outputted CSS and it seems to cause issues.
I checked with @markvanlan as well, we no longer use this property in a plugin, so it’s safe to revert.