Fix Conflict in Tailwind CSS 4 with React 19 and PostCSS

[Minhajkarim]

Dear Tailwind CSS Team,

I am experiencing a build failure when using Tailwind CSS 4 with React 19 and PostCSS. The error message indicates that tailwindcss should not be used directly as a PostCSS plugin and suggests installing @tailwindcss/postcss. However, no such package exists, and following previous PostCSS setup instructions does not resolve the issue.

Steps to Reproduce:

1. Install Tailwind CSS 4, PostCSS, and Autoprefixer in a React 19 project:

   npm install -D tailwindcss@latest postcss@latest autoprefixer@latest

2. Run npx tailwindcss init -p.
3. Start the development server (npm start).

Expected Behavior:
Tailwind CSS should compile without errors and work seamlessly with PostCSS.

Actual Behavior:
The build fails with a PostCSS-related error, preventing the project from running.

Could you please look into this issue and provide a fix or guidance on how to resolve it? Many developers are encountering this problem, and a resolution would be greatly appreciated.

Thank you for your amazing work on Tailwind! 🚀

Best regards,
Minhaj