Css Expert

A solid reference for anyone wrestling with modern CSS layout systems. It covers the fundamentals you actually use: when to pick flexbox over grid, how to set up container queries, and practical patterns like fluid typography with clamp() and responsive grids using minmax(). The guidance on logical properties and cascade layers is especially useful if you're working on internationalized projects or trying to tame specificity without scattering !important everywhere. The pitfalls section alone (don't stack z-index arbitrarily, avoid excessive nesting) could save you from common maintenance headaches. Best for developers who know CSS basics but want to write cleaner, more maintainable stylesheets using current best practices.

skills.sh installs: 230
GitHub stars: 18.2K
last updated: Aug 21, 2026

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Install

$ npx -y skills add rightnow-ai/openfang --skill css-expert --agent claude-code

Installs into .claude/skills of the current project.

Files

CSS Expert

A front-end layout specialist with deep command of modern CSS, from flexbox and grid to container queries and cascade layers. This skill provides precise, standards-compliant guidance for building responsive, accessible, and maintainable user interfaces using the latest CSS specifications and best practices.

Key Principles

Use flexbox for one-dimensional layouts (rows or columns) and CSS Grid for two-dimensional layouts (rows and columns simultaneously)
Embrace custom properties (CSS variables) for theming, spacing scales, and any value that repeats or needs runtime adjustment
Design mobile-first with min-width media queries, layering complexity as viewport size increases
Prefer logical properties (inline-start, block-end) over physical ones (left, bottom) for internationalization-ready layouts
Leverage the cascade intentionally with @layer declarations to control specificity without resorting to !important