user interface – Can the GUI style be changed?

I am not asking how to change the background colour. Is it possible to change the theme of the GUI on the outside? It looks horrible having a light interface and dark notepad. I think a material dark theme would be really nice.

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My question is short but I don’t think anything else needs to be said. Please let me know otherwise. If someone experienced on this site could help me with which tags to use, that would be appreciated.