Pygments, the backend of the SyntaxHighlight, comes with some built-in styles. (Pygments style gallery)
But the extension always serves the 'default' style.

Feature summary (what you would like to be able to do):

There are few options:

1. Modify maintenance script to accept a style parameter and encourage skin developers to generated and include the style.
2. Introduce a wiki-scope configuration variable to set a style that applies to all syntaxhighlights.
3. Add a parameter to for style. example:
4. Provide CSS classes to be used by whoever wants.
5. Allow users to choose a default in Special:Preference.

Use case(s) (describe the actual underlying problem which you want to solve, and not only a solution):

We need to support this in order to support Vector 2022's night mode.

Maybe there are demands as templates for that exist. See https://www.mediawiki.org/wiki/Template:Codesample.