How to add the two floating sidebar banners?

Does anyone know how to add two floating sidebar banners like in the picture below?

They would appear only on Desktop, obviously.

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There are several topics on the forum that may be helpful.

https://meta.discourse.org/t/can-we-have-customizable-sidebar-blocks/64989

I think the best solution is not to use plugins, but for this you need to study:

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