Material Design 3 Color and Dynamic Theming

Overview

This skill guides the application of Material Design 3 (M3) Expressive color and theming principles to create vibrant, accessible, and emotionally engaging user interfaces.

Keywords: Material Design 3, M3, dynamic color, theming, color palette, Material You, accessibility, color tokens, surface colors, accent colors, fixed accent colors, emphasis colors, contrast levels

Core Principles

Dynamic Color System

Material Design 3's color system is built on the concept of dynamic color, allowing interfaces to adapt to user preferences and contexts:

Tonal Palettes: Use five key tonal palettes (Primary, Secondary, Tertiary, Neutral, Neutral Variant) with multiple tones (0-100)
Color Roles: Map 26+ color roles to UI elements (e.g., primary, onPrimary, primaryContainer, onPrimaryContainer)
Adaptive Theming: Support both light and dark themes with appropriate contrast
User Personalization: Allow color schemes to adapt based on user wallpaper or preferences (Material You)
Fixed Accent Colors: Provide color tokens that remain consistent across light and dark themes for brand identity
Emphasis Colors: Use bolder, more vibrant color roles for key UI elements to improve clarity and emotional resonance

Color Palette Structure

When creating color palettes, follow this structure:

Primary Palette (Main brand color):

Primary: Main interactive elements (buttons, active states)
On Primary: Text/icons on primary color
Primary Container: Standout fill color for key components
On Primary Container: Text/icons on primary container
Primary Fixed: Stays constant across light and dark themes
On Primary Fixed: Text/icons on primary fixed
Primary Fixed Dim: Dimmed variant for secondary emphasis on fixed surfaces

Secondary Palette (Complementary accent):

Secondary: Less prominent components
On Secondary: Text/icons on secondary
Secondary Container: Tinted backgrounds
On Secondary Container: Text/icons on secondary container
Secondary Fixed: Stays constant across light and dark themes
On Secondary Fixed: Text/icons on secondary fixed
Secondary Fixed Dim: Dimmed variant for fixed surfaces

Tertiary Palette (Contrasting accent — now a prominent expressive accent for branding and highlights):

Tertiary: Contrasting accents and highlights
On Tertiary: Text/icons on tertiary
Tertiary Container: Input elements
On Tertiary Container: Text/icons on tertiary container
Tertiary Fixed: Stays constant across light and dark themes
On Tertiary Fixed: Text/icons on tertiary fixed
Tertiary Fixed Dim: Dimmed variant for fixed surfaces

Neutral Palettes (Surfaces and backgrounds):

Surface: Default background for components
On Surface: Text on surface
Surface Variant: Alternate surface color
On Surface Variant: Text on surface variant
Surface Dim: Dimmed surface for reduced emphasis
Surface Bright: Brighter surface for increased emphasis
Surface Container Lowest: Lowest-emphasis container surface
Surface Container Low: Low-emphasis container surface
Surface Container: Default container surface
Surface Container High: High-emphasis container surface
Surface Container Highest: Highest-emphasis container surface
Outline: Borders and dividers
Outline Variant: Decorative elements
Inverse Surface: Inverted surface for contrast elements (e.g., snackbars)
Inverse On Surface: Text on inverse surface
Inverse Primary: Primary color used on inverse surfaces

Error/Warning/Success (Feedback colors):

Error, Warning, Success with corresponding "On" colors and containers

Accessibility Guidelines

Contrast Levels (M3 Expressive standardizes three levels):
- Standard: Default contrast suitable for most users
- Medium: Enhanced contrast for improved readability
- High: Maximum contrast for users with low vision or high-contrast preferences
- All three levels are tokenized for easy implementation
Contrast Requirements:
- Text contrast: Minimum 4.5:1 for body text, 3:1 for large text (WCAG AA)
- Interactive elements: Minimum 3:1 contrast with background
- Use "On" colors to ensure proper contrast
Color Independence:
- Never rely solely on color to convey information
- Use icons, text labels, or patterns alongside color
- Ensure color-blind friendly combinations
Dynamic Range:
- Light theme: Higher tones (90-99) for surfaces, lower tones (10-40) for emphasis
- Dark theme: Lower tones (10-20) for surfaces, higher tones (80-90) for emphasis

Implementation Guidelines

Color Token System

Use CSS custom properties (variables) for all colors. M3 Expressive introduces 26+ color roles:

:root {
  /* Primary */
  --md-sys-color-primary: #6750A4;
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-primary-container: #EADDFF;
  --md-sys-color-on-primary-container: #21005D;
  
  /* Primary Fixed (consistent across themes) */
  --md-sys-color-primary-fixed: #EADDFF;
  --md-sys-color-on-primary-fixed: #21005D;
  --md-sys-color-primary-fixed-dim: #D0BCFF;
  --md-sys-color-on-primary-fixed-variant: #4F378B;
  
  /* Secondary */
  --md-sys-color-secondary: #625B71;
  --md-sys-color-on-secondary: #FFFFFF;
  --md-sys-color-secondary-container: #E8DEF8;
  --md-sys-color-on-secondary-container: #1D192B;
  
  /* Secondary Fixed */
  --md-sys-color-secondary-fixed: #E8DEF8;
  --md-sys-color-on-secondary-fixed: #1D192B;
  --md-sys-color-secondary-fixed-dim: #CCC2DC;
  --md-sys-color-on-secondary-fixed-variant: #4A4458;
  
  /* Tertiary */
  --md-sys-color-tertiary: #7D5260;
  --md-sys-color-on-tertiary: #FFFFFF;
  --md-sys-color-tertiary-container: #FFD8E4;
  --md-sys-color-on-tertiary-container: #31111D;
  
  /* Tertiary Fixed */
  --md-sys-color-tertiary-fixed: #FFD8E4;
  --md-sys-color-on-tertiary-fixed: #31111D;
  --md-sys-color-tertiary-fixed-dim: #EFB8C8;
  --md-sys-color-on-tertiary-fixed-variant: #633B48;
  
  /* Surface and Surface Containers */
  --md-sys-color-surface: #FEF7FF;
  --md-sys-color-on-surface: #1D1B20;
  --md-sys-color-surface-variant: #E7E0EC;
  --md-sys-color-on-surface-variant: #49454F;
  --md-sys-color-surface-dim: #DED8E1;
  --md-sys-color-surface-bright: #FEF7FF;
  --md-sys-color-surface-container-lowest: #FFFFFF;
  --md-sys-color-surface-container-low: #F7F2FA;
  --md-sys-color-surface-container: #F3EDF7;
  --md-sys-color-surface-container-high: #ECE6F0;
  --md-sys-color-surface-container-highest: #E6E0E9;
  
  /* Inverse */
  --md-sys-color-inverse-surface: #322F35;
  --md-sys-color-inverse-on-surface: #F5EFF7;
  --md-sys-color-inverse-primary: #D0BCFF;
  
  /* Outlines */
  --md-sys-color-outline: #79747E;
  --md-sys-color-outline-variant: #CAC4D0;
  
  /* Error */
  --md-sys-color-error: #B3261E;
  --md-sys-color-on-error: #FFFFFF;
  --md-sys-color-error-container: #F9DEDC;
  --md-sys-color-on-error-container: #410E0B;
  
  /* Scrim and Shadow */
  --md-sys-color-scrim: #000000;
  --md-sys-color-shadow: #000000;
}

[data-theme="dark"] {
  /* Primary */
  --md-sys-color-primary: #D0BCFF;
  --md-sys-color-on-primary: #381E72;
  --md-sys-color-primary-container: #4F378B;
  --md-sys-color-on-primary-container: #EADDFF;
  
  /* Primary Fixed (same as light — these don't change) */
  --md-sys-color-primary-fixed: #EADDFF;
  --md-sys-color-on-primary-fixed: #21005D;
  --md-sys-color-primary-fixed-dim: #D0BCFF;
  --md-sys-color-on-primary-fixed-variant: #4F378B;
  
  /* Secondary */
  --md-sys-color-secondary: #CCC2DC;
  --md-sys-color-on-secondary: #332D41;
  --md-sys-color-secondary-container: #4A4458;
  --md-sys-color-on-secondary-container: #E8DEF8;
  
  /* Secondary Fixed (same as light) */
  --md-sys-color-secondary-fixed: #E8DEF8;
  --md-sys-color-on-secondary-fixed: #1D192B;
  --md-sys-color-secondary-fixed-dim: #CCC2DC;
  --md-sys-color-on-secondary-fixed-variant: #4A4458;
  
  /* Tertiary */
  --md-sys-color-tertiary: #EFB8C8;
  --md-sys-color-on-tertiary: #492532;
  --md-sys-color-tertiary-container: #633B48;
  --md-sys-color-on-tertiary-container: #FFD8E4;
  
  /* Tertiary Fixed (same as light) */
  --md-sys-color-tertiary-fixed: #FFD8E4;
  --md-sys-color-on-tertiary-fixed: #31111D;
  --md-sys-color-tertiary-fixed-dim: #EFB8C8;
  --md-sys-color-on-tertiary-fixed-variant: #633B48;
  
  /* Surface and Surface Containers */
  --md-sys-color-surface: #141218;
  --md-sys-color-on-surface: #E6E0E9;
  --md-sys-color-surface-variant: #49454F;
  --md-sys-color-on-surface-variant: #CAC4D0;
  --md-sys-color-surface-dim: #141218;
  --md-sys-color-surface-bright: #3B383E;
  --md-sys-color-surface-container-lowest: #0F0D13;
  --md-sys-color-surface-container-low: #1D1B20;
  --md-sys-color-surface-container: #211F26;
  --md-sys-color-surface-container-high: #2B2930;
  --md-sys-color-surface-container-highest: #36343B;
  
  /* Inverse */
  --md-sys-color-inverse-surface: #E6E0E9;
  --md-sys-color-inverse-on-surface: #322F35;
  --md-sys-color-inverse-primary: #6750A4;
  
  /* Outlines */
  --md-sys-color-outline: #938F99;
  --md-sys-color-outline-variant: #49454F;
  
  /* Error */
  --md-sys-color-error: #F2B8B5;
  --md-sys-color-on-error: #601410;
  --md-sys-color-error-container: #8C1D18;
  --md-sys-color-on-error-container: #F9DEDC;
  
  /* Scrim and Shadow */
  --md-sys-color-scrim: #000000;
  --md-sys-color-shadow: #000000;
}

Fixed Accent Colors

Fixed accent colors are new in M3 Expressive. They maintain the same value across light and dark themes, useful for brand identity elements:

/* Fixed colors remain identical in both themes */
.brand-banner {
  background-color: var(--md-sys-color-primary-fixed);
  color: var(--md-sys-color-on-primary-fixed);
}

.brand-accent {
  background-color: var(--md-sys-color-tertiary-fixed);
  color: var(--md-sys-color-on-tertiary-fixed);
}

/* Fixed Dim for secondary emphasis on fixed surfaces */
.brand-banner-secondary {
  background-color: var(--md-sys-color-primary-fixed-dim);
  color: var(--md-sys-color-on-primary-fixed);
}

Contrast Level System

M3 Expressive standardizes three contrast levels for accessibility:

/* Standard contrast (default) */
:root {
  --md-sys-color-contrast-level: 0;
}

/* Medium contrast */
[data-contrast="medium"] {
  --md-sys-color-primary: #5640A0;
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-primary-container: #7B68BA;
  --md-sys-color-on-primary-container: #FFFFFF;
}

/* High contrast */
[data-contrast="high"] {
  --md-sys-color-primary: #2D0F6E;
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-primary-container: #4E3A87;
  --md-sys-color-on-primary-container: #FFFFFF;
}

Color Application

Interactive Elements:
- Filled buttons: Use primary color with on-primary text
- Outlined buttons: Use outline with primary text
- Text buttons: Use primary text only
- FABs: Use primary-container with on-primary-container
- Button Groups: Use surface-container with on-surface text
Surfaces and Containers:
- Main background: surface
- Elevated components (cards, dialogs): surface-container variants
- Input fields: surface-container-highest
- Snackbars: inverse-surface with inverse-on-surface text
- Bottom sheets: surface-container-low
State Layers:
- Hover: Apply 8% opacity layer of on-surface
- Focus: Apply 12% opacity layer of on-surface
- Pressed: Apply 12% opacity layer of on-surface
- Dragged: Apply 16% opacity layer of on-surface
Emphasis and Brand:
- Use fixed accent colors for brand elements that must remain consistent
- Apply emphasis through color saturation and contrast, not just hue
- Use tertiary as an expressive accent for onboarding, highlights, and branding

Dynamic Color Generation

When generating color schemes from a source color:

Extract Core Hue: Identify the dominant hue from the source (e.g., user wallpaper)
Generate Tonal Palettes: Create five tonal palettes using HCT (Hue, Chroma, Tone) color space
Assign Color Roles: Map generated tones to semantic color roles (26+ roles)
Generate Fixed Variants: Create fixed accent colors that remain constant across themes
Generate Surface Containers: Create the five-level surface container hierarchy
Generate Contrast Variants: Produce standard, medium, and high contrast versions
Validate Contrast: Ensure all role pairs meet accessibility requirements
Support Themes: Generate both light and dark variants

Best Practices

Semantic Naming: Always use semantic color tokens (e.g., primary, error) rather than literal colors (e.g., blue, red)
Consistent Application: Apply colors consistently across all components
Elevation Tinting: Add subtle tint to elevated surfaces using primary color at very low opacity
Color Hierarchy: Use primary for main actions, secondary for less important actions, tertiary for expressive accents
Test Both Themes: Always test in both light and dark modes
Vibrant Expression: In M3 Expressive, embrace richer, more vibrant colors while maintaining accessibility
Context Awareness: Adapt color intensity and palette based on app context and user preferences
Use Fixed Colors for Branding: Apply fixed accent tokens for logo colors or elements that must not change between themes
Support Contrast Levels: Implement standard, medium, and high contrast variants for accessibility
Surface Container Hierarchy: Use the five surface container levels to create clear visual depth

Tools and Resources

tokens.css: Ready-to-use M3 color tokens (light + dark) based on the orange baseline palette (#FF9800), included in this skill's directory. Copy into your project and customize.
examples/color-roles.svg: Visual reference SVG showing M3 color roles (primary, secondary, tertiary, error), surface container tones, and the primary tonal palette. Use as a stakeholder reference or documentation asset.
material-theme-builder skill: Use to generate a complete token set from any source color programmatically.
Material Color Utilities: https://github.com/material-foundation/material-color-utilities — HCT color space, palette generation, and dynamic color algorithms
Material Theme Builder: https://material-foundation.github.io/material-theme-builder/ — interactive web tool for generating color schemes
Official M3 CSS tokens: https://github.com/material-foundation/material-tokens — baseline CSS token files (colors, typography, shape, motion, state, elevation)
M3 color system: https://m3.material.io/styles/color/overview
M3 design tokens overview: https://m3.material.io/foundations/design-tokens/overview
Color Contrast Checker: Validate WCAG compliance for all text and interactive elements
HCT Color Space: Leverage for perceptually uniform color generation
CSS Custom Properties: Implement dynamic theming with CSS variables and data attributes

Common Pitfalls to Avoid

❌ Hard-coding color values instead of using tokens
❌ Using only one color for all states (no hover, focus, pressed variations)
❌ Ignoring dark theme or treating it as an afterthought
❌ Insufficient contrast between text and background
❌ Overusing accent colors (they should be used sparingly for emphasis)
❌ Not testing with actual user-generated color schemes
❌ Relying only on color to communicate state or information
❌ Forgetting to define fixed accent colors for brand elements
❌ Not implementing multiple contrast levels for accessibility
❌ Using surface instead of the appropriate surface container variant

Checklist for Color Implementation

When implementing M3 color systems, ensure: