Panel color in all themes

[ghalestrilo]

Nature of issue?

• Existing feature enhancement

Feature enhancement details:

Following discussion from #1467 , Panels are deeper colored layout containers, like the Console Header (on IDE Screen) and the Mobile Header and Footer components

As it stands, their background color is very similar to the background of Button components, which is a problem if we want to place a Button inside a Panel.
Tough it hasn't happened yet, we have to find a suitable alternative for when it does.

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