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Charts behave differently than other elements in the sense that they do not order themselves according to css properties, but rather in the order in which they were created (this is also true for all svg / canvas elements).
So, please check if both elements are being created. If they are, render the outer edge first, then render the inner afterwards.
If not please share a little bit more on why you think it doesn’t work and what you have tried.
Good luck on this!
Source:stackexchange.com