I use tailwind v4 for the first time on my projects. I use yarn and in dev mode it works fine, but when i want to deploy to vercel, or execute yarn build, i receive the following error:

MacBook-Pro-2:next-app xxx$ yarn build
yarn run v1.22.22
$ next build
   ▲ Next.js 15.2.3

   Creating an optimized production build ...
<w> [webpack.cache.PackFileCacheStrategy] Skipped not serializable cache item 'Compilation/modules|/Users/xxx/Desktop/Web/pb/next-app/node_modules/next/dist/build/webpack/loaders/css-loader/src/index.js??ruleSet[1].rules[13].oneOf[10].use[2]!/Users/xxx/Desktop/Web/pb/next-app/node_modules/next/dist/build/webpack/loaders/postcss-loader/src/index.js??ruleSet[1].rules[13].oneOf[10].use[3]!/Users/xxx/Desktop/Web/pb/next-app/app/styles/globals.css': No serializer registered for PostCSSSyntaxError
<w> while serializing webpack/lib/cache/PackFileCacheStrategy.PackContentItems -> webpack/lib/NormalModule -> webpack/lib/ModuleBuildError -> PostCSSSyntaxError
Failed to compile.

./app/styles/globals.css:2:6138
Syntax error: tailwindcss: /Users/xxx/Desktop/Web/pb/next-app/app/styles/globals.css Missed semicolon

  1 | /*! tailwindcss v4.0.15 | MIT License |  */

Node.js version is: v20.17.0

globals.css

@import "tailwindcss";

:root {
  --color-primary: #b90305;
  --color-primaryAccent: #cdd7de;
  --color-secondary: #dbdbdb;
  --color-secondaryAccent: #f3f6f8;
  --color-black: #080b0d;
}

i installed tailwind same as in this instruction:

package.json

{
  "name": "next-app",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "dev": "next dev --turbopack",
    "build": "next build",
    "start": "next start",
    "lint": "next lint"
  },
  "dependencies": {
    "lucide-react": "^0.483.0",
    "next": "15.2.3",
    "postcss": "^8.5.3",
    "react": "^19.0.0",
    "react-dom": "^19.0.0",
    "react-hook-form": "^7.54.2"
  },
  "devDependencies": {
    "@tailwindcss/postcss": "^4.0.15",
    "@types/node": "^20",
    "@types/react": "^19",
    "@types/react-dom": "^19",
    "tailwindcss": "^4.0.15",
    "typescript": "^5"
  }
}

postcss.config.mjs

export default {
  plugins: { "@tailwindcss/postcss": {} },
};

if you need more informations about my project, please let me know.

I want to deploy my Next.js Project to vercel or want to execute yarn build.