Does this skill handle responsive design?

Yes, it prioritizes container queries over media queries to create truly modular components that adapt to their parent container's size rather than just the viewport.

Can it help with web accessibility (a11y)?

Absolutely. It enforces the use of relative units like 'rem', checks color contrast against WCAG standards, and ensures interactive elements meet touch target and keyboard navigation requirements.

How does this differ from standard AI CSS generation?

This skill specifically targets the 'Modern CSS' era (2023-2025), avoiding legacy hacks and prioritizing native features like @layer, container queries, and subgrid for cleaner, more maintainable code.

Can I use this with CSS frameworks like Tailwind or Bootstrap?

Yes, it can integrate with existing frameworks and uses the context7 MCP to fetch up-to-date documentation for any CSS library to ensure idiomatic implementation.

Modern CSS Expert

Name: Modern CSS Expert
Author: dannysmith

bydannysmith

0•

Design Tools

Architects production-grade, accessible user interfaces using the latest CSS features like cascade layers, container queries, and OKLCH color spaces.

The Modern CSS Expert skill transforms Claude into a high-level frontend architect focused on the 2023-2025 CSS specifications. It moves beyond legacy approaches by implementing advanced features such as @layer for specificity management, container queries for component-driven responsiveness, and the OKLCH color space for perceptually uniform design systems. This skill is ideal for developers building resilient, future-proof UI components that prioritize accessibility, defensive coding patterns, and high-performance layout engines without relying on heavy JavaScript alternatives.

Key Features

01Advanced color systems utilizing OKLCH, relative color syntax, and the light-dark() function for effortless theming.

02Architecture-first approach using semantic design tokens and fluid typography with clamp() and container units.

03Defensive CSS strategies to prevent layout breakage and handle dynamic content edge cases.

04Expert implementation of modern CSS features including Cascade Layers, Container Queries, and the :has() selector.

05Visual verification and debugging using integrated Chrome DevTools for screenshots and computed style analysis.

060 GitHub stars

Use Cases

01Designing accessible and themeable design systems from scratch using cascade layers and semantic tokens.

02Refactoring legacy media-query-based projects into modern, component-first container query architectures.

03Debugging complex layout issues and specificity conflicts in large-scale CSS codebases.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add dannysmith/claude-marketplace css-expert

For use in Claude.ai and ChatGPT

Download Skill