Active grey not visible on some monitors

[lyubomir-popov]

@cassiocassio pointed to this dovetail user testing session, in which a user remarks that he doesn't get visual feedback when changing between segmented tabs - meaning, the active grey colour is not distinguishable from thee page background on his particular screen.

He makes a similar comment about code snippets. I think in the case of code snippets, it might be less of an accessibility concern, as they are not interactive, but our active states should definitely have a 3:1 contrast change between states, to ensure thery work monitors with a very limited range of contrast, as seems to be the case here:

dovetail link (requires dovetail access)

[danielmutis]

WG: this needs to be addressed. @lyubomir-popov will take a look at some point. This is open for any other ideas from the team.