Inverse accordion focus & active state colour

[cherylhjli]

Is your feature request related to a problem? Please describe.

When working through the map view summary visual design, Dana and I found blue 200 a little overwhelming when it contains a lot of information inside, like so:

Describe the solution you'd like

Is it possible to change anywhere blue 200 appears in the inverse accordion to blue 100? Like so:

Additional context

Not a high priority feature :)

[greatislander]

@jhung can perhaps address this in #380?