[openstreetmap-website] Notabs (#18)

[Tom Hughes]

One small problem that I've noticed with this branch is that the border at the top of the content area is missing underneath the tabs.

It's not very noticeable on the frontpage because of the map (but it is there if you look closely) but on other pages it is very noticeable.

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https://github.com/openstreetmap/openstreetmap-website/pull/18#issuecomment-4186064