nav transition on mobile (using pure CSS)
nav transition on mobile (using pure CSS)

pre CSS: good performance and low bandwidth (no jquery)
contra CSS: hacky; navigation is only hidden via `max-width: 0`

kub-berlin/kub-template,kub-berlin/kub-template,xi/kub-template,xi/kub-template,kub-berlin/kub-template,xi/kub-template