How to use the CSS of the WordPress core in the development of my administration page?

Frank Bültge has a plugin which displays all (most?) of the WP admin styles, which is kept fairly up-to-date:
https://github.com/bueltge/WordPress-Admin-Style

Helen Hou-Sandí also has a plugin style guide:
https://github.com/helen/wp-style-guide

There is also this:
https://dotorgstyleguide.wordpress.com/

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