use-tailwind-v4
Tailwind CSS v4 syntax and v3→v4 migration reference. Use when the user mentions 'Tailwind v4', 'upgrade Tailwind', @theme, @utility, or @import 'tailwindcss', or is working in a project whose config indicates v4.
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- 49
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/nweii/agent-stuff --skill use-tailwind-v4- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads use-tailwind-v4 automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Tailwind CSS v4
v4 Syntax At a Glance
Imports and Setup
/* v4 import (replaces @tailwind directives) */
@import "tailwindcss";
/* Custom utilities (replaces @layer utilities) */
@utility tab-4 {
tab-size: 4;
}
/* Loading JS config (if still needed) */
@config "../../tailwind.config.js";
CSS Variables for Theme
v4 exposes all theme values as CSS variables. Prefer these over theme():
background-color: var(--color-red-500);
font-family: var(--font-sans);
Quick Reference: v3 → v4 Changes
Renamed Utilities
| v3 | v4 | Notes |
|---|---|---|
shadow-sm | shadow-xs | Scale shifted |
shadow | shadow-sm | Scale shifted |
drop-shadow-sm | drop-shadow-xs | Scale shifted |
drop-shadow | drop-shadow-sm | Scale shifted |
blur-sm | blur-xs | Scale shifted |
blur | blur-sm | Scale shifted |
backdrop-blur-sm | backdrop-blur-xs | Scale shifted |
backdrop-blur | backdrop-blur-sm | Scale shifted |
rounded-sm | rounded-xs | Scale shifted |
rounded | rounded-sm | Scale shifted |
outline-none | outline-hidden | outline-none now sets outline-style: none |
ring | ring-3 | Default changed from 3px to 1px |
Deprecated Utilities (Use Opacity Modifiers)
<!-- v3: opacity utilities -->
<div class="bg-black bg-opacity-50">
<!-- v4: opacity modifiers -->
<div class="bg-black/50">
Also: flex-shrink-* → shrink-*, flex-grow-* → grow-*, overflow-ellipsis → text-ellipsis
Default Changes
| What | v3 Default | v4 Default |
|---|---|---|
| Border color | gray-200 | currentColor |
| Ring width | 3px | 1px |
| Ring color | blue-500 | currentColor |
| Button cursor | pointer | default |
Variant Stacking Order
Changed from right-to-left to left-to-right:
<!-- v3 -->
<ul class="first:*:pt-0">
<!-- v4 -->
<ul class="*:first:pt-0">
Variable Syntax in Arbitrary Values
<!-- v3: square brackets -->
<div class="bg-[--brand-color]">
<!-- v4: parentheses -->
<div class="bg-(--brand-color)">
Prefix Syntax
<!-- v4 prefixes are at the start, like variants -->
<div class="tw:flex tw:bg-red-500 tw:hover:bg-red-600">
Upgrading Projects
For project migrations, run the automated upgrade tool:
npx @tailwindcss/upgrade
Requires Node.js 20+. Run in a new branch and review changes.
For complete migration details (PostCSS/Vite/CLI config, custom utilities, framework-specific issues), see references/upgrade-guide.md.
FAQ
What does the use-tailwind-v4 skill do?
Tailwind CSS v4 syntax and v3→v4 migration reference. Use when the user mentions 'Tailwind v4', 'upgrade Tailwind', @theme, @utility, or @import 'tailwindcss', or is working in a project whose config indicates v4.
How do I install use-tailwind-v4?
Run npx skills add https://github.com/nweii/agent-stuff --skill use-tailwind-v4 in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/use-tailwind-v4/ (personal) or .claude/skills/use-tailwind-v4/ (project).
Which AI agents can use use-tailwind-v4?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is use-tailwind-v4 safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains use-tailwind-v4?
It is published by nweii in nweii/agent-stuff. It has 49 recorded installs.
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