tailwindcss-v4

Tailwind CSS v4.1 configuration uses a CSS-first approach where you define custom theme variables directly in CSS using the @theme directive. This replaces the traditional JavaScript configuration file, streamlining the setup process for web styling.

Migrating from Tailwind CSS v3 to v4 involves understanding specific breaking changes and utilizing provided upgrade tools. The transition focuses on adopting the new CSS-first configuration syntax and replacing outdated utility definitions.

Tailwind CSS v4 allows you to create custom utility classes and variants using the @utility and @variant directives. These enable you to define custom styling logic directly within your CSS files for efficient web development.

Defining a custom color variable in Tailwind CSS v4 involves using the @theme directive to declare CSS variables. For example, you can define a custom 'brand' color variable directly in CSS, making it available across your utility classes.

Yes, the @apply directive is supported in Tailwind CSS v4.1. You can use it to extract component classes and apply utility styles directly within custom CSS, maintaining compatibility with your existing styling workflow.

You need to use CSS variables for theme customization in Tailwind CSS v4 when adopting the CSS-first configuration approach. This method allows you to define design tokens like colors and spacing directly in CSS, replacing the old JavaScript config.