How to change the Announcement Widget colour?

I am able to change the image but it doesn’t change the background colour, how do I do this?

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Documentation for this widget can be found here:

However, it doesn’t cover changing the colour. This can be done in the Theming of your application (Settings > Themes > Colours > Announcement widget background / foreground)

See more details on Themes:

Credit @sures for sharing the answer to this one.