---
name: thedaviddias/css-minification
source: https://app.decimal.ai/s/thedaviddias-css-minification@1/SKILL.md
source_sha256: 5ec16bb8563f
---

# Minify all CSS files

Unminified CSS wastes bandwidth with whitespace, comments, and verbose syntax—minification delivers the same styles in significantly fewer bytes.

## Quick Reference

- Enable minification in build tool (Vite, webpack, etc.)
- Use cssnano or lightningcss for PostCSS pipelines
- Typical reduction: 20-40% file size savings
- Combine with Gzip/Brotli for maximum compression

## Check

Verify that all CSS files are minified in production to reduce file size, eliminate whitespace, and improve page load performance.

## Fix

Set up CSS minification in your build process using tools like cssnano, CleanCSS, or built-in framework minification to compress CSS files.

## Explain

Explain how CSS minification improves website performance by reducing file sizes, decreasing bandwidth usage, and speeding up page load times.

## Code Review

Review stylesheets, component styles, and responsive states related to Minify all CSS files. Flag exact selectors, declarations, or breakpoints that violate the rule in the rendered UI.

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For full implementation details, code examples, and framework-specific guidance,
see `references/rule.md`.

Rule page: https://frontendchecklist.io/en/rules/css/css-minification