marimo-css 0.1.12

Write CSS in a marimo notebook

marimo-css

[!WARNING] This is an opinonated personal tool not an official marimo tool - May 2026.

pypi names are forever

Write CSS in a marimo notebook — then extract, lint*, and minify it.

*opinonated checks

Install

pip install marimo-css

Commands

css extract            # notebooks → css files
css extract --min      # extract, then minify
css lint               # lint .css files (project-wide)
css lint path/to.css   # lint one file
css minify file.css    # strip comments + whitespace → stdout
css check              # extract + lint in one pass

extract, check default to ./notebooks/*.py. lint defaults to the whole project — it finds the root by walking up to pyproject.toml.

What the linter checks

Per file:

• @property blocks are at the top level, not nested in a rule
• @property blocks declare all three descriptors — syntax, inherits, initial-value
• no raw hex colors — prefer a token
• every transition with a time value routes through --cfg-motion

Project-wide:

• every @layer used in a block is also declared in the layer order
• layers declared but never used
• custom properties: declared & used, declared but never used, and used but never declared (the last usually means a typo)

Errors exit non-zero; warnings don't. Full results are written to css_lint.log.

Exit codes

0 clean or warnings only · 1 one or more errors.