tailwind-css

name	tailwind-css
description	Tailwind CSS utility-first styling. Use when building UIs with Tailwind classes, responsive design, dark mode, flexbox/grid layouts, hover/focus states, or any frontend styling with utility classes. Triggers include "Tailwind", "utility classes", "responsive design", "dark mode styling", or CSS layout questions.

Tailwind CSS

Utility-first CSS framework. Style by combining single-purpose classes directly in markup.

Core Concepts

Utility Classes

<div class="flex items-center gap-4 p-6 bg-white rounded-xl shadow-lg">
  <img class="size-12 rounded-full" src="..." />
  <div>
    <h3 class="text-xl font-medium text-black">Title</h3>
    <p class="text-gray-500">Description</p>
  </div>
</div>

State Variants

<button class="bg-sky-500 hover:bg-sky-700 focus:ring-2 active:bg-sky-800">
  Save
</button>
<input class="border focus:border-blue-500 focus:ring-1" />
<button class="bg-blue-500 disabled:opacity-50 disabled:cursor-not-allowed">

Responsive (Mobile-First)

Prefix	Min Width	CSS
(none)	0	Default (mobile)
sm:	640px	@media (width >= 40rem)
md:	768px	@media (width >= 48rem)
lg:	1024px	@media (width >= 64rem)
xl:	1280px	@media (width >= 80rem)
2xl:	1536px	@media (width >= 96rem)

<!-- Stack on mobile, side-by-side on md+ -->
<div class="flex flex-col md:flex-row gap-4">
  <div class="w-full md:w-1/2">...</div>
  <div class="w-full md:w-1/2">...</div>
</div>

Dark Mode

<div class="bg-white dark:bg-gray-800">
  <h1 class="text-gray-900 dark:text-white">Title</h1>
  <p class="text-gray-500 dark:text-gray-400">Text</p>
</div>

Common Patterns

Flexbox Layout

<div class="flex items-center justify-between">     <!-- Horizontal, spaced -->
<div class="flex flex-col gap-4">                   <!-- Vertical stack -->
<div class="flex-1">                                <!-- Grow to fill -->
<div class="flex-none">                             <!-- Don't grow/shrink -->
<div class="shrink-0">                              <!-- Prevent shrinking -->

Grid Layout

<div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6">
<div class="col-span-2">                            <!-- Span 2 columns -->

Spacing

<div class="p-4">           <!-- Padding all sides -->
<div class="px-6 py-4">     <!-- Horizontal/vertical padding -->
<div class="mt-4 mb-2">     <!-- Margin top/bottom -->
<div class="space-y-4">     <!-- Vertical spacing between children -->
<div class="gap-4">         <!-- Gap in flex/grid -->

Sizing

<div class="w-full max-w-md">     <!-- Full width, max 448px -->
<div class="h-screen">            <!-- Full viewport height -->
<div class="size-12">             <!-- 48px width AND height -->
<div class="min-h-0">             <!-- For flex overflow fix -->

Typography

<h1 class="text-2xl font-bold text-gray-900">
<p class="text-sm text-gray-500 leading-relaxed">
<span class="font-medium">
<a class="text-blue-600 hover:underline">

Cards & Containers

<div class="bg-white rounded-lg shadow-md p-6">
<div class="border border-gray-200 rounded-xl">
<div class="ring-1 ring-gray-900/5">

Arbitrary Values

<div class="w-[327px]">           <!-- Exact width -->
<div class="bg-[#1da1f2]">        <!-- Custom color -->
<div class="grid-cols-[1fr_2fr]"> <!-- Custom grid -->

Best Practices

1. Mobile-first: Write base styles for mobile, add sm:, md: for larger
2. Avoid @apply: Use utilities directly; extract components instead
3. Consistent spacing: Use the scale (4, 6, 8, 12...) not arbitrary values
4. Group related: Keep layout, spacing, colors logically grouped in class lists

References

For detailed docs, see references/ directory:

• responsive.md — Breakpoints and responsive patterns
• dark-mode.md — Dark mode configuration
• layout.md — Flexbox and grid patterns