How to change background color of Rader chart in ChartJS? - reactjs

Copied the example of a Radar Chart from the react chartjs site.
https://react-chartjs-2.js.org/examples/radar-chart
I have managed to get it working and have this:
However I really want to change the background color of the chart itself. Here is an example of what I mean:
I have looked through the docs and cannot find a solution. Any help will be so appreciated.

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