Should You Import Tailwind CSS in App.css or index.css?

If you've just set up a React project and you're staring at both App.css and index.css wondering where to drop your Tailwind directives — you're not alone. It's one of those small decisions that feels trivial but can quietly affect how your project scales. The answer depends on how your project is structured, what framework you're using, and how you expect your styles to load.

What the Tailwind Directives Actually Do

When you add Tailwind to a project, you typically include three directives in a CSS file: