Map overlay hover style

[FilipLeitner]

Define map overlay hover styles.

Map overlay includes toolbar, ol-controls, custom ol-controls, basemap gallery (scale and hs-info also but those don't use hover property )

[jmacura]

I think hs-info component is a bit too aggressive now. Can we change its background from --ol-background-color

to --ol-partial-background-color ?

Or I would make this message a bit less spacious. Like a one-liner next to the scale. Or omit its heading. Now it takes too much attention to my taste...

[FilipLeitner]

True, looks better with --ol-partial-background-color. Regarding title, Id be for omitting it for the 'unsaved map' case as its basically just says the same info twice.