Material You Slides Skill

Create presentation slide decks as single-file HTML using the Material You (Material Design 3) design language. The output is a self-contained .html file optimized for 1280x720 presentation dimensions, printable via @page rules.

When to Use

Use this skill when the user asks to create slides, presentations, or decks and wants (or would benefit from) a clean, modern Material Design 3 look. This is the default slide style unless the user explicitly requests a different theme.

Design Principles

1. M3 Color Tokens - Use CSS custom properties following Material Design 3 naming (--md-sys-color-*).
2. Roboto Typography - Import from Google Fonts. Use weights 300 (light/subtitle), 400 (body), 500 (medium), 600 (semibold headings), 700 (bold), 800-900 (display/hero).
3. Rounded Shapes - Four tiers of corner radius: small (8px), medium (12px), large (16px), extra-large (28px).
4. Surface Hierarchy - Use surface, surface-container-low, surface-container, surface-container-high for layered depth without drop shadows.
5. Container Colors - Cards use *-container / on-*-container pairs for accessible contrast.
6. No Drop Shadows - Rely on surface tones and subtle borders for elevation.
7. Generous Whitespace - Slide padding 24px 48px. Card padding 24px. Gap 16-32px between elements.

CSS Foundation

Every generated deck MUST include this CSS foundation in a <style> block. You may add component-specific styles but must not remove or override these base tokens.

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700;900&display=swap');
@page { size: 1280px 720px; margin: 0; }
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* M3 Color Palette - Blue Theme */
  --md-sys-color-primary: #005AC1;
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-primary-container: #D8E2FF;
  --md-sys-color-on-primary-container: #001A41;

  --md-sys-color-secondary: #575E71;
  --md-sys-color-on-secondary: #FFFFFF;
  --md-sys-color-secondary-container: #DBE2F9;
  --md-sys-color-on-secondary-container: #141B2C;

  --md-sys-color-tertiary: #715573;
  --md-sys-color-on-tertiary: #FFFFFF;
  --md-sys-color-tertiary-container: #FBD7FC;
  --md-sys-color-on-tertiary-container: #29132D;

  --md-sys-color-error: #BA1A1A;
  --md-sys-color-error-container: #FFDAD6;

  --md-sys-color-surface: #FEF7FF;
  --md-sys-color-on-surface: #1D1B20;
  --md-sys-color-surface-container-low: #F7F2FA;
  --md-sys-color-surface-container: #F3EDF7;
  --md-sys-color-surface-container-high: #ECE6F0;

  --md-sys-color-outline: #74777F;
  --md-sys-color-outline-variant: #C4C6CF;

  /* Custom Accents */
  --accent-blue: #005AC1;
  --accent-teal: #006D5B;
  --accent-gold: #735C00;

  /* Shape */
  --md-sys-shape-corner-extra-large: 28px;
  --md-sys-shape-corner-large: 16px;
  --md-sys-shape-corner-medium: 12px;
  --md-sys-shape-corner-small: 8px;

  /* Typography */
  --font-heading: 'Roboto', -apple-system, sans-serif;
  --font-body: 'Roboto', -apple-system, sans-serif;
}

body {
  font-family: var(--font-body);
  background: #fff;
  color: var(--md-sys-color-on-surface);
  -webkit-font-smoothing: antialiased;
  font-size: 24px;
}

Slide Types

1. Title Slide (.slide-title)

Full-bleed primary-color background with radial gradient accents. Used for the opening and closing slides.

<div class="slide slide-title">
  <div class="brand-line"></div>
  <h1>Presentation Title</h1>
  <div class="subtitle">A concise tagline or description</div>
  <div class="meta-info">
    <div class="author">Author / Team Name</div>
  </div>
</div>

CSS:

.slide-title {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  justify-content: center;
  align-items: flex-start;
  padding-left: 100px;
  background-image: radial-gradient(circle at 90% 10%, rgba(255,255,255,0.1) 0%, transparent 40%),
                    radial-gradient(circle at 80% 90%, rgba(255,255,255,0.05) 0%, transparent 30%);
}
.slide-title .brand-line {
  width: 80px; height: 10px;
  background: var(--md-sys-color-tertiary-container);
  border-radius: 5px; margin-bottom: 40px;
}
.slide-title h1 {
  font-family: var(--font-heading);
  font-size: 96px; font-weight: 800;
  letter-spacing: -2px; line-height: 1.1; margin-bottom: 24px;
}
.slide-title .subtitle {
  font-size: 40px; font-weight: 300;
  opacity: 0.9; margin-bottom: 80px; max-width: 900px;
}
.slide-title .meta-info { display: flex; gap: 40px; align-items: center; }
.slide-title .author {
  font-size: 24px; font-weight: 500;
  background: rgba(255,255,255,0.15);
  padding: 16px 32px; border-radius: 50px;
}

2. Section Divider (.slide-section)

Light surface background with a left-edge primary color bar and a large translucent section number.

<div class="slide slide-section">
  <div class="section-num">01</div>
  <h2>Section Title</h2>
  <div class="section-sub">Subtitle or English tagline</div>
</div>

CSS:

.slide-section {
  background: var(--md-sys-color-surface-container-low);
  color: var(--md-sys-color-on-surface);
  justify-content: center;
  position: relative;
}
.slide-section::before {
  content: "";
  position: absolute;
  top: 0; left: 0; bottom: 0; width: 24px;
  background: var(--md-sys-color-primary);
}
.slide-section .section-num {
  font-size: 180px; font-weight: 900;
  color: var(--md-sys-color-primary-container);
  position: absolute; top: -30px; right: 60px; opacity: 0.5;
}
.slide-section h2 { font-size: 72px; font-weight: 700; line-height: 1.2; z-index: 1; position: relative; }
.slide-section .section-sub {
  font-size: 32px; color: var(--md-sys-color-secondary);
  margin-top: 32px; font-weight: 400; z-index: 1;
}

3. Content Slide (.slide-content)

The workhorse slide with a header (tag + title) and a flexible body area.

<div class="slide slide-content">
  <div class="header">
    <div class="header-top">
      <div class="header-tag">TAG</div>
    </div>
    <h3>Slide Title</h3>
  </div>
  <div class="body">
    <!-- Content goes here -->
  </div>
  <div class="page-num">3</div>
</div>

CSS:

.slide {
  width: 1280px; height: 720px;
  page-break-after: always; position: relative; overflow: hidden;
  padding: 24px 48px; display: flex; flex-direction: column;
  background-color: var(--md-sys-color-surface);
}
.slide:last-child { page-break-after: avoid; }

.slide-content .header {
  display: flex; flex-direction: column; align-items: flex-start;
  margin-bottom: 20px; gap: 12px;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  padding-bottom: 16px; flex-shrink: 0;
}
.slide-content .header-top {
  display: flex; align-items: center; width: 100%; justify-content: space-between;
}
.slide-content .header-tag {
  background: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  font-size: 16px; font-weight: 600;
  padding: 6px 20px; border-radius: 100px;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.slide-content .header h3 {
  font-size: 42px; font-weight: 600;
  color: var(--md-sys-color-on-surface); letter-spacing: -0.5px; line-height: 1.2;
}
.slide-content .body { flex: 1; display: flex; flex-direction: column; gap: 16px; min-height: 0; }
.page-num {
  position: absolute; bottom: 24px; right: 40px;
  font-size: 16px; color: var(--md-sys-color-outline); font-variant-numeric: tabular-nums;
}

Component Library

Cards

Use M3 container color pairs. Variants: primary, secondary, tertiary, outlined.

<div class="card">Default surface card</div>
<div class="card primary">Primary container card</div>
<div class="card secondary">Secondary container card</div>
<div class="card tertiary">Tertiary container card</div>
<div class="card outlined">Outlined card (transparent bg, border)</div>

.card {
  background: var(--md-sys-color-surface-container);
  border-radius: var(--md-sys-shape-corner-extra-large);
  padding: 24px; display: flex; flex-direction: column; gap: 12px;
  box-shadow: none; position: relative;
}
.card.primary { background: var(--md-sys-color-primary-container); color: var(--md-sys-color-on-primary-container); }
.card.secondary { background: var(--md-sys-color-secondary-container); color: var(--md-sys-color-on-secondary-container); }
.card.tertiary { background: var(--md-sys-color-tertiary-container); color: var(--md-sys-color-on-tertiary-container); }
.card.outlined { background: transparent; border: 1px solid var(--md-sys-color-outline-variant); }
.card-title { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.card-text { font-size: 22px; line-height: 1.5; opacity: 0.9; }

Layouts

.columns { display: flex; gap: 32px; flex: 1; min-height: 0; }
.column { flex: 1; display: flex; flex-direction: column; gap: 16px; min-height: 0; }
.col-60 { flex: 3; }
.col-40 { flex: 2; }

Lists

Styled with primary-colored bullet dots, no default list-style.

ul { list-style: none; padding: 0; }
ul li {
  font-size: 24px; line-height: 1.5;
  padding: 6px 0 6px 32px; position: relative;
  color: var(--md-sys-color-on-surface);
}
ul li::before {
  content: "\2022"; position: absolute; left: 8px;
  color: var(--md-sys-color-primary); font-weight: 900; font-size: 24px;
}

Tables

Rounded-corner tables with surface-container header background.

table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-large); overflow: hidden;
}
table th {
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  padding: 12px 20px; text-align: left; font-weight: 700; font-size: 20px;
}
table td {
  padding: 12px 20px;
  border-top: 1px solid var(--md-sys-color-outline-variant);
  color: var(--md-sys-color-on-surface); font-size: 20px;
}

Tags / Chips

<span class="tag">Default</span>
<span class="tag blue">Blue</span>
<span class="tag green">Green</span>
<span class="tag red">Red</span>

.tag {
  display: inline-flex; align-items: center;
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
  font-size: 16px; font-weight: 500;
  padding: 6px 14px; border-radius: 8px; margin-right: 8px;
}
.tag.blue { background: #D8E2FF; color: #001A41; }
.tag.green { background: #C4EED0; color: #072111; }
.tag.red { background: #FFDAD6; color: #410002; }

Flow Diagrams

Horizontal process flows with bordered boxes and arrow connectors.

<div class="flow-row">
  <div class="flow-box dark">Step 1</div>
  <div class="flow-arrow">&rarr;</div>
  <div class="flow-box">Step 2</div>
  <div class="flow-arrow">&rarr;</div>
  <div class="flow-box dark" style="background:var(--accent-teal);">Step 3</div>
</div>

.flow-row { display: flex; align-items: center; gap: 12px; justify-content: center; margin: 16px 0; }
.flow-box {
  background: var(--md-sys-color-surface);
  border: 2px solid var(--md-sys-color-primary);
  border-radius: 16px; padding: 12px 20px;
  text-align: center; min-width: 120px; font-weight: 600; font-size: 18px;
}
.flow-box.dark { background: var(--md-sys-color-primary); color: var(--md-sys-color-on-primary); border: none; }
.flow-arrow { color: var(--md-sys-color-outline); font-size: 24px; }

Metric Cards

Large numeric KPI displays in a row.

<div class="metric-row">
  <div class="metric-card">
    <div class="val">42%</div>
    <div class="label">Description</div>
  </div>
</div>

.metric-row { display: flex; gap: 24px; }
.metric-card {
  flex: 1; background: var(--md-sys-color-surface-container);
  border-radius: 20px; padding: 24px; text-align: center;
}
.metric-card .val { font-size: 56px; font-weight: 800; color: var(--md-sys-color-primary); line-height: 1; margin-bottom: 8px; }
.metric-card .label { font-size: 20px; color: var(--md-sys-color-secondary); }

Code Blocks

Dark-themed code display with syntax highlight classes.

.code-block {
  background: #1E1E1E; color: #D4D4D4;
  border-radius: var(--md-sys-shape-corner-large);
  padding: 20px;
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 16px; line-height: 1.6;
  overflow: hidden; white-space: pre-wrap;
}
.code-block .kw { color: #569CD6; }   /* keywords */
.code-block .str { color: #CE9178; }  /* strings */
.code-block .cmt { color: #6A9955; font-style: italic; } /* comments */

Typical Deck Structure

A well-structured deck follows this pattern:

1. Title Slide (.slide-title) - Project name, tagline, author
2. Agenda/Overview Slide (.slide-content) - Grid of outlined cards with colored left borders for each section
3. Section Divider (.slide-section) - For each major part (01, 02, 03...)
4. Content Slides (.slide-content) - The actual content using cards, columns, tables, flow diagrams, code blocks, metrics
5. Closing Slide (.slide-title) - "Thanks!" with links and credits

Color Customization

The default theme is Blue. To create a different color variant, replace the --md-sys-color-primary family with a new hue while keeping the M3 tonal structure:

• Generate tonal palette from a seed color
• Keep surface/outline tokens unchanged for consistency
• Update --accent-* custom properties to complement the new primary

Content Density Guidelines

• Max 3-4 key points per content slide
• Use columns (.columns > .column) for side-by-side comparisons
• Use tables for structured comparisons (max 5-6 rows visible)
• Use flow diagrams for process explanations
• Use metric cards for KPI/result highlights (max 3-4 per row)
• Use code blocks sparingly, only for key snippets
• Font sizes: Body text 22-24px, card text 16-22px, table 20px, code 16px
• Agenda slide: Use a 2x2 grid of outlined cards with colored left borders (border-left: 6px solid)

Output Format

Generate a single self-contained .html file. All CSS is inlined in a <style> tag. No external dependencies except the Google Fonts import. The file should be directly openable in a browser for presentation.