Customizable colors or color theme

[softhuntermike]

Is your feature request related to a problem? Please describe.
Some default color combinations are not very easy to the eyes. One example is the AQI bubble, it's very hard to see the actual characters when the value is in Moderate range. (see attached pic)

Describe the solution you'd like
Adding the possibility to customize color for each element of the card. If not possible at this time, please at least change the default to be more contrast.

Additional context
Add any other context or screenshots about the feature request here.

[softhuntermike]

This is an example of how a good color scheme is, when AQI is in Good range