Syntax highlighting for package documentation

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When generating the documentation of my package, the syntax of code examples has only Python highlighting (words like and, not, is and numbers have colors).

Additionally, I want all occurring sage: statements to be highlighted (similar as in the official SageMath documentation).

Currently, I use make html (or sphinx-build . build/html) in my docs folder. Do I need a different command? Or am I missing a setting in my conf.py file?

Thank you in advance!