[Component:Callout] Default variant for `Callout` does not meet WCAG color contrast requirements for certain colors

[dbollinger]

Context

Component: Callout

Expected behavior

Default text styles should meet WCAG color contrast requirements

Actual behavior

Color contrast fails for color="red" and color="green"

Workarounds

Use highContrast option

Related issues

#694

[dbollinger]

Might be conceptually resolved by #694