Background color and inertia scrolling.

[Carreau]

Nitpicking but when inertia-scrolling you can get some white at the top of the page (or bottom).
You can have a "cleaner" website by setting the background color as being the same as the header:

See example:

That's screwing other sections which needs to be colored, so no PR (for now), and the same happen in the footer at the bottom of the page... Not sure how to deal with it... gradient maybe ?

[rgbkrk]

There's a theme color prop somewhere that can be used for this, so I don't think it would be too bad to override the overall background color.