Is your proposal related to a problem?

We've implemented this feature in our fork of the project, but it might be interesting to other users too. We can open a PR if this looks like a good feature.

main...lincolnloop:django-pattern-library:main

Describe the solution you'd like

You can see it in use here:

https://github.com/mozmeao/springfield/blob/main/media/css/pattern_library/theme.css

Describe alternatives you've considered

(Write your answer here.)

Additional context

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