Documentation

@theme {
  --color-brand: oklch(0.72 0.11 178);
}

Import Syntax

In Tailwind v4, import Tailwind with a regular CSS @import statement instead of the @tailwind directives used in v3:

- @tailwind base;
- @tailwind components;
- @tailwind utilities;
+ @import "tailwindcss";

Replaced Utilities

Tailwind v4 removed deprecated utilities. Use the replacements shown below. Opacity values remain numeric.

Spacing

Use gap utilities instead of margins for spacing between siblings:

<div class="flex gap-8">
    <div>Item 1</div>
    <div>Item 2</div>
</div>

Dark Mode

If existing pages and components support dark mode, new pages and components must support it the same way, typically using the dark: variant:

<div class="bg-white dark:bg-gray-900 text-gray-900 dark:text-white">
    Content adapts to color scheme
</div>

Common Patterns

Flexbox Layout

<div class="flex items-center justify-between gap-4">
    <div>Left content</div>
    <div>Right content</div>
</div>

Grid Layout

<div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
    <div>Card 1</div>
    <div>Card 2</div>
    <div>Card 3</div>
</div>

Common Pitfalls

• Using deprecated v3 utilities (bg-opacity-, flex-shrink-, etc.)
• Using @tailwind directives instead of @import "tailwindcss"
• Trying to use tailwind.config.js instead of CSS @theme directive
• Using margins for spacing between siblings instead of gap utilities
• Forgetting to add dark mode variants when the project uses dark mode