css-standards

Enforce HSL color format and CSS custom properties in CSS files.

Updated Oct 25, 2025

Search Tags:#accessibility #css #hsl #colors #design-system #css-variables

Ready to run

npx skills add https://github.com/cynthiateeters/hybit-svg --skill css-standards

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Please help me install this Agent Skill.
Skill: css-standards
Source: https://github.com/cynthiateeters/hybit-svg/tree/main/.claude/skills/css-standards
Command: npx skills add https://github.com/cynthiateeters/hybit-svg --skill css-standards

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill ensures CSS color tokens follow a single, modern standard. It prevents hardcoded hex/rgb colors and enforces the use of HSL color formats and CSS custom properties, enabling a consistent design system and easier theme updates.

Core Features & Use Cases

Enforces HSL format for all color values to promote readability and accessibility.
Single source of truth by defining colors in one place (e.g., :root) and referencing them via CSS custom properties.
Guides color naming and usage to ensure semantic, accessible design across components.
Use Case: Before starting a new UI, run this Skill to ensure the CSS color tokens are defined in :root and all components reference them.

Quick Start

Use this skill before writing any CSS to set up the color tokens and enforcement rules in your project.

Frequently Asked Questions about css-standards

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I enforce HSL colors and CSS variables across my design system?▼

HSL color format with CSS custom properties creates a single source of truth for colors. Define all colors in :root as CSS variables using hsl() syntax, then reference them with var() throughout your stylesheets. This enables consistent theming and prevents hardcoded hex or rgb values from fragmenting your design system.

Why should I use HSL instead of hex or RGB for CSS colors?▼

HSL (hue, saturation, lightness) is more human-readable and accessible than hex or RGB. It lets you adjust brightness and saturation predictably, supports alpha transparency directly in the hsl() function, and makes semantic color relationships clearer for maintaining design systems at scale.

What's the best way to set up color tokens in CSS?▼

Define color tokens in :root using CSS custom properties with hsl() syntax, including alpha values where needed. Name them semantically (e.g., --color-primary, --color-success) and reference them with var() in all component styles. This approach centralizes color management and makes theme updates require changes in one place only.

Can I use CSS variables with HSL colors in existing projects?▼

Yes. CSS custom properties and hsl() syntax work in all modern browsers. You can migrate existing hex or rgb colors to HSL and CSS variables incrementally—update :root with new token definitions, then gradually replace hardcoded colors with var() references across components and templates.

Do I need to update color values when switching to HSL and CSS variables?▼

Not necessarily. Most design tools and online converters translate hex and RGB colors to equivalent HSL values. Once converted to :root CSS variables, you define colors once and reference them everywhere, eliminating redundancy and making future adjustments faster.

What accessibility benefits does HSL provide for color design?▼

HSL separates lightness from hue, making it easier to ensure sufficient contrast ratios and maintain accessible color relationships. CSS variables enable consistent application of accessible colors across components, and the hsl() syntax supports alpha transparency for layering without hardcoding opacity values separately.