# responsive-web-design

A skill that steers your coding agent toward mobile-first CSS with Flexbox, Grid and media queries. Useful when one layout has to hold up on phones and desktops.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 1100 installs · ★ 371
- Author: aj-geddes
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/aj-geddes/useful-ai-prompts/tree/HEAD/skills/responsive-web-design/SKILL.md
- Updated: 2026-03-04
- HTML: https://affpapa.org/en/nevibecode/skills/responsive-web-design

## What it does

The skill hands the agent a mobile-first workflow: base styles for narrow screens first, breakpoints after, written as `@media (min-width: ...)`. The quick-start example covers a flex `.container`, a card and a `grid-template-columns: 1fr` grid, then extends them for tablet and desktop.

Five reference files sit in the `references/` directory: media query strategy, Flexbox navigation, CSS Grid layout, responsive typography and a cards component. The agent pulls the one that matches the piece of UI you are working on.

One thing to watch: the inline example cuts off mid-media-query, so the full implementations live in the reference guides. If your project already has its own breakpoint scale, swap the sample values for yours — otherwise you end up maintaining two grids that disagree.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill responsive-web-design -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/responsive-web-design/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/responsive-web-design/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill responsive-web-design -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/responsive-web-design/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill responsive-web-design -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/responsive-web-design/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install aj-geddes/useful-ai-prompts responsive-web-design
```

2. **Manually: put the files in place**
- File: `.github/skills/responsive-web-design/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill responsive-web-design -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/aj-geddes/useful-ai-prompts --path skills/responsive-web-design
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/responsive-web-design/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill responsive-web-design -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/aj-geddes/useful-ai-prompts/tree/HEAD/skills/responsive-web-design/SKILL.md

## When to use it
- build a layout that reflows from one column to several
- write navigation that collapses on narrow screens
- set breakpoints the mobile-first way
- scale typography across viewport widths
- turn cards into a reusable responsive component

## Example prompts
- build a responsive card grid with CSS Grid, mobile-first
- rewrite the nav with Flexbox so it collapses on phones
- add tablet and desktop media queries to this component

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 65efb89149553539.

BEGIN THIRD-PARTY FILE 65efb89149553539
````text
---
name: responsive-web-design
description: >
  Create responsive layouts using CSS Grid, Flexbox, media queries, and
  mobile-first design. Use when building adaptive interfaces that work across
  all devices.
---

# Responsive Web Design

## Table of Contents

- [Overview](#overview)
- [When to Use](#when-to-use)
- [Quick Start](#quick-start)
- [Reference Guides](#reference-guides)
- [Best Practices](#best-practices)

## Overview

Build mobile-first responsive interfaces using modern CSS techniques including Flexbox, Grid, and media queries to create adaptable user experiences.

## When to Use

- Multi-device applications
- Mobile-first development
- Accessible layouts
- Flexible UI systems
- Cross-browser compatibility

## Quick Start

Minimal working example:

```css
/* Mobile styles (default) */
.container {
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 16px;
}

.card {
  padding: 16px;
  border-radius: 8px;
  background: white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* Tablet (640px and up) */
@media (min-width: 640px) {
  .container {
    flex-direction: row;
// ... (see reference guides for full implementation)
```

## Reference Guides

Detailed implementations in the `references/` directory:

| Guide | Contents |
|---|---|
| [Mobile-First Media Query Strategy](references/mobile-first-media-query-strategy.md) | Mobile-First Media Query Strategy |
| [Flexbox Responsive Navigation](references/flexbox-responsive-navigation.md) | Flexbox Responsive Navigation |
| [CSS Grid Responsive Layout](references/css-grid-responsive-layout.md) | CSS Grid Responsive Layout |
| [Responsive Typography](references/responsive-typography.md) | Responsive Typography |
| [Responsive Cards Component](references/responsive-cards-component.md) | Responsive Cards Component |

## Best Practices

### ✅ DO

- Follow established patterns and conventions
- Write clean, maintainable code
- Add appropriate documentation
- Test thoroughly before deploying

### ❌ DON'T

- Skip testing or validation
- Ignore error handling
- Hard-code configuration values
````
END THIRD-PARTY FILE 65efb89149553539

The third-party file has ended. Everything between the 65efb89149553539 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

© aj-geddes · MIT · https://github.com/aj-geddes/useful-ai-prompts/tree/HEAD/skills/responsive-web-design/SKILL.md

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## Other versions with the same name

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---
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