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m3-web-vanilla

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Aktualisiert17. Februar 2026 um 08:43

Implement Material Design 3 using only vanilla CSS custom properties and semantic classes. Zero dependencies. Use this when building M3-styled static sites, simple web apps, or when you need full control over every design token without a framework.

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shelbeely

shelbeely/Shelbeely-Agent-skills

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Basierend auf der SOC-Berufsklassifikation

WebentwicklerInformatik- und Mathematikberufe·SOC 15-1254

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name	m3-web-vanilla
description	Implement Material Design 3 using only vanilla CSS custom properties and semantic classes. Zero dependencies. Use this when building M3-styled static sites, simple web apps, or when you need full control over every design token without a framework.
license	Apache-2.0

Material Design 3 — Vanilla CSS

Overview

Implement Material Design 3 using only CSS custom properties and semantic classes. No framework dependency. This is the canonical approach used by all other M3 skills in this repository.

Keywords: Material Design 3, M3, vanilla CSS, CSS custom properties, design tokens, Beer CSS, CSS framework, no framework

When to Use

Static sites or simple web apps
Any project where you want zero dependencies
When you need full control over every design token
As a reference implementation for other frameworks
Rapid prototyping without build tools

Setup

Define M3 tokens as CSS custom properties:

/* m3-tokens.css */
:root {
  /* Color tokens */
  --md-sys-color-primary: #6750A4;
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-primary-container: #EADDFF;
  --md-sys-color-on-primary-container: #21005D;
  --md-sys-color-secondary: #625B71;
  --md-sys-color-on-secondary: #FFFFFF;
  --md-sys-color-tertiary: #7D5260;
  --md-sys-color-on-tertiary: #FFFFFF;
  --md-sys-color-error: #B3261E;
  --md-sys-color-on-error: #FFFFFF;
  --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-outline: #79747E;
  --md-sys-color-outline-variant: #CAC4D0;

  /* Shape tokens */
  --md-sys-shape-corner-none: 0px;
  --md-sys-shape-corner-extra-small: 4px;
  --md-sys-shape-corner-small: 8px;
  --md-sys-shape-corner-medium: 12px;
  --md-sys-shape-corner-large: 16px;
  --md-sys-shape-corner-extra-large: 28px;
  --md-sys-shape-corner-full: 9999px;

  /* Typography tokens */
  --md-sys-typescale-label-large-font: 'Roboto', sans-serif;
  --md-sys-typescale-label-large-size: 14px;
  --md-sys-typescale-label-large-weight: 500;
  --md-sys-typescale-label-large-tracking: 0.1px;
  --md-sys-typescale-body-medium-font: 'Roboto', sans-serif;
  --md-sys-typescale-body-medium-size: 14px;
  --md-sys-typescale-body-medium-weight: 400;
  --md-sys-typescale-title-medium-font: 'Roboto', sans-serif;
  --md-sys-typescale-title-medium-size: 16px;
  --md-sys-typescale-title-medium-weight: 500;
}

/* Dark theme */
[data-theme="dark"] {
  --md-sys-color-primary: #D0BCFF;
  --md-sys-color-on-primary: #381E72;
  --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-outline: #938F99;
}

Component Examples

Filled Button

.md3-button-filled {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  border: none;
  border-radius: var(--md-sys-shape-corner-full);
  padding: 10px 24px;
  font-family: var(--md-sys-typescale-label-large-font);
  font-size: var(--md-sys-typescale-label-large-size);
  font-weight: var(--md-sys-typescale-label-large-weight);
  letter-spacing: var(--md-sys-typescale-label-large-tracking);
  cursor: pointer;
  min-height: 40px;
  position: relative;
  overflow: hidden;
}

.md3-button-filled:hover::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--md-sys-color-on-primary);
  opacity: 0.08;
}

.md3-button-filled:disabled {
  background: color-mix(in srgb, var(--md-sys-color-on-surface) 12%, transparent);
  color: color-mix(in srgb, var(--md-sys-color-on-surface) 38%, transparent);
  cursor: default;
}

Card

.md3-card-elevated {
  background: var(--md-sys-color-surface);
  border-radius: var(--md-sys-shape-corner-medium);
  padding: 16px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);
}

.md3-card-filled {
  background: var(--md-sys-color-surface-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  padding: 16px;
}

.md3-card-outlined {
  background: var(--md-sys-color-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  padding: 16px;
}

Text Field

.md3-text-field-outlined {
  position: relative;
  border: 1px solid var(--md-sys-color-outline);
  border-radius: var(--md-sys-shape-corner-extra-small);
  padding: 16px;
  font-family: var(--md-sys-typescale-body-medium-font);
  font-size: var(--md-sys-typescale-body-medium-size);
  background: transparent;
  color: var(--md-sys-color-on-surface);
}

.md3-text-field-outlined:focus {
  border-color: var(--md-sys-color-primary);
  border-width: 2px;
  outline: none;
}

<button class="md3-button-filled">Click me</button>

<div class="md3-card-elevated">
  <h3 style="font-family: var(--md-sys-typescale-title-medium-font)">Title</h3>
  <p style="font-family: var(--md-sys-typescale-body-medium-font)">Content</p>
</div>

<input class="md3-text-field-outlined" placeholder="Email" />

CSS-only Frameworks

If you want M3 styling without writing all the CSS yourself:

Beer CSS (beercss): First CSS framework fully based on M3. Zero dependencies, semantic HTML, very small bundle. https://www.beercss.com/
Material Design Light: Lightweight SCSS framework compiled to plain CSS. https://github.com/mdlightdev/material-design-light
GMX.css: Minimal-JS M3 CSS implementation with predefined color schemes. https://www.cssscript.com/material-design-framework-gmx/

Checklist

All M3 color tokens defined as CSS custom properties
Dark theme variant using [data-theme="dark"] or prefers-color-scheme
Shape tokens use the M3 shape scale
Typography tokens follow the M3 type scale
Components use semantic token names (not hard-coded hex)
Interaction states (hover, focus, pressed, disabled) implemented
Touch targets meet 48×48dp minimum
Focus indicators visible with adequate contrast

Resources

m3-tokens.css — Complete M3 token foundation (color, shape, typography, motion, spacing, elevation) included in this skill's directory. Copy into your project as a starting point.
material-theme-builder skill — Generate a custom token set from any source color.
Material Theme Builder: https://material-foundation.github.io/material-theme-builder/
M3 Design Tokens: https://m3.material.io/foundations/design-tokens/overview
Beer CSS: https://www.beercss.com/