Skill: jhauga/html-css-style-color-guide (version 1.0.0)

--- name: html-css-style-color-guide description: 'Color usage guidelines and styling rules for HTML and CSS elements to ensure accessible, professional designs. Use when creating or updating HTML/CSS styles, choosing colors for web pages, styling backgrounds, text, buttons, or gradients. Applies the 60-30-10 rule for balanced color schemes.' --- # HTML CSS Style Color Guide Follow these guidelines when updating or creating HTML/CSS styles for browser rendering. Color names represent the full spectrum of their respective hue ranges (e.g., "blue" includes navy, sky blue, etc.). ## When to Use This Skill - Creating or updating HTML/CSS styles - Choosing colors for web page elements - Styling backgrounds, text, buttons, cards, or gradients - Ensuring accessible color combinations - Applying professional color schemes ## Color Definitions - **Hot Colors**: Oranges, reds, and yellows - **Cool Colors**: Blues, greens, and purples - **Neutral Colors**: Grays and grayscale variations - **Binary Colors**: Black and white - **60-30-10 Rule** - **Primary Color**: Use 60% of the time (*cool or light color*) - **Secondary Color**: Use 30% of the time (*cool or light color*) - **Accent**: Use 10% of the time (*complementary hot color*) ## Color Usage Guidelines Balance the colors used by applying the **60-30-10 rule** to graphic design elements like backgrounds, buttons, cards, etc... ### Background Colors **Never Use:** - Purple or magenta - Red, orange, or yellow - Pink - Any hot color **Recommended:** - White or off-white - Light cool colors (e.g., light blues, light greens) - Subtle neutral tones - Light gradients with minimal color shift ### Text Colors **Never Use:** - Yellow (poor contrast and readability) - Pink - Pure white or light text on light backgrounds - Pure black or dark text on dark backgrounds **Recommended:** - Dark neutral colors (e.g., #1f2328, #24292f) - Near-black variations (#000000 to #333333) - Ensure background is a light color - Dark grays (#4d4d4d, #6c757d) - High-contrast combinations for accessibility - Near-white variations (#ffffff to #f0f2f3) - Ensure background is a dark color ### Colors to Avoid Unless explicitly required by design specifications or user request, avoid: - Bright purples and magentas - Bright pinks and neon colors - Highly saturated hot colors - Colors with low contrast ratios (fails WCAG accessibility standards) ### Colors to Use Sparingly **Hot Colors** (red, orange, yellow): - Reserve for critical alerts, warnings, or error messages - Use only when conveying urgency or importance - Limit to small accent areas rather than large sections - Consider alternatives like icons or bold text before using hot colors ## Gradients Apply gradients with subtle color transitions to maintain professional aesthetics. ### Best Practices - Keep color shifts minimal (e.g., #E6F2FF to #F5F7FA) - Use gradients within the same color family - Avoid combining hot and cool colors in a single gradient - Prefer linear gradients over radial for backgrounds ### Appropriate Use Cases - Background containers and sections - Button hover states and interactive elements - Drop shadows and depth effects - Header and navigation bars - Card components and panels ## Additional Resources - [Color Tool](https://civicactions.github.io/uswds-color-tool/) - [Government or Professional Color Standards](https://designsystem.digital.gov/design-tokens/color/overview/) - [UI Color Palette Best Practices](https://www.interaction-design.org/literature/article/ui-color-palette) - [Color Combination Resource](https://www.figma.com/resource-library/color-combinations/)


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