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

Users should be able to easily configure the accordion content background.

Describe the solution you'd like

A new theme setting for content background color.

Describe alternatives you've considered

Using $theme-body-background-color.

Additional context

Based on slack thread

Code of Conduct

• I agree to follow this project's Code of Conduct.
• I checked the current issues for duplicate feature requests.