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How to change the background color for Bar Polar charts?

How can I change the background color for Bar Polar charts?
I tried setting plot_bgcolor=rgb(70,70,70) in the layout element but nothing changed.

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Hi @winklerrr you also need to change the color of the polar axes:

fig.update_polars(bgcolor='black')
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As a follow up to the previous question:
I would like to have a fully transparent background, but the radial axes set to black and dashed lines. Is it possible?

Thanks