Try the classic navbar at the top of this page. On a narrow screen, focus Toggle navigation and press Enter or Space to show the links. Open a dropdown with Enter or Space, use the arrow keys to move between its links, and press Escape to close it.
This demo shows the updated navbar controls available in v2.2.0 and later. They are not included in the v2.1.0 gem or a remote theme pinned to that release.
The navbar stays at the top while you scroll. It uses this site's
menu entries and navbar.expand breakpoint, rendered by the
same classic component as a standard theme page.
For your own menu, follow Add or change a menu link. Style and breakpoint values are in the navbar reference.