# Tailwindcss Responsive

> Use when applying responsive variants at different screen widths, defining a custom breakpoint, or building container-query-based components.

- Skill: `fusengine/tailwindcss-responsive` (Agent Skill)
- Install (CLI): `npx skillmds@latest add fusengine/tailwindcss-responsive`
- Raw SKILL.md: https://api.skillmd.com/api/skills/fusengine/tailwindcss-responsive/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: fusengine (https://skillmd.com/u/fusengine)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/fusengine/tailwindcss-responsive

---


<objective>
Documents responsive design utilities in Tailwind CSS v4: the default breakpoint scale (`sm`/`md`/`lg`/`xl`/`2xl`), defining custom breakpoints via `@theme`, container queries (`@container`, `@md`, `@lg` container-relative variants), and the mobile-first authoring pattern (base styles first, larger-breakpoint overrides layered on top).
</objective>

# Responsive Design

## Default Breakpoints

| Variant | Size | CSS |
|---------|--------|-----|
| `sm:` | 40rem (640px) | `@media (width >= 40rem)` |
| `md:` | 48rem (768px) | `@media (width >= 48rem)` |
| `lg:` | 64rem (1024px) | `@media (width >= 64rem)` |
| `xl:` | 80rem (1280px) | `@media (width >= 80rem)` |
| `2xl:` | 96rem (1536px) | `@media (width >= 96rem)` |

## Custom breakpoint
```css
@theme {
  --breakpoint-3xl: 120rem;
}
/* Usage: 3xl:grid-cols-6 */
```

## Container Queries v4
```html
<div class="@container">
  <div class="@md:grid-cols-2 @lg:grid-cols-3">
    <!-- Responsive to container -->
  </div>
</div>
```

## Mobile-first
```html
<div class="text-sm md:text-base lg:text-lg">
  <!-- Small screens first -->
</div>
```