Costruire Next.JS e tailwindcss

Io uso TailwindCSS e NextJs per la mia app. Funziona tutto, quando ho npm run dev ma quando ho npm run build quindi npm run start Ho alcune classi che non funziona. Per esempio in questo codice, h-20 / text-white non lavoro, ma altri tailwind classi sono perfettamente funzionanti...

<div class="flex text-white font-semibold cursor-pointer">
<div class="flex-1 h-20 center-hv text-center bg-blue-primary hover:bg-blue-hover button-shadow">
    <div>
        <div>Acheter 200 €</div>
    </div>
</div> 
</div>

C'è il mio confs :

//next.config.js

module.exports = {
    images: {
      domains: ["picsum.photos"],
    },
    env: {
      customKey: 'my-value',
    }
  }

//postcss.config.js

module.exports = {
  plugins: {
    tailwindcss: {},
    autoprefixer: {},
  },
}

//tailwind.css

module.exports = {
  purge: ['./pages/**/*.{js,ts,jsx,tsx}', './components/**/*.{js,ts,jsx,tsx}'],
  darkMode: false, // or 'media' or 'class'
  theme: {
    extend: {
      backgroundColor: theme => ({
        ...theme('colors'),
        'blue-primary': '#A9C4D2',
        'blue-secondary': '#bbd9e8',
        'blue-hover': '#74afcd',
        'alert-info': '#d5e9f3',
        'alert-warning': '#ffd585',
        'alert-danger': '#ffb3b3'
      }),
      textColor: theme => ({
        ...theme('colors'),
        'blue-primary': '#A9C4D2',
        'blue-secondary': '#bbd9e8',
        'blue-hover': '#74afcd',
        'alert-info': '#d5e9f3',
        'alert-warning': '#ffd585',
        'alert-danger': '#ffb3b3'
      }),
    },
    flex: {
      '1': '1 1 0%',
      '2': '2 2 0%',
      '3': '3 3 0%',
      '4': '4 4 0%',
      '5': '5 5 0%',
      auto: '1 1 auto',
      initial: '0 1 auto',
      inherit: 'inherit',
      none: 'none',
    }
  },
  variants: {
    extend: {},
  },
  plugins: [],
}

//jsconfig.json

{
    "typeAcquisition": {
        "include": ["jest"]
    }
}

//_app.js

import Navigation from '../componsants/navigation/Navigation'
import '../styles/globals.css'
import 'tailwindcss/tailwind.css'

function MyApp({ Component, pageProps }) {

  return (
    <>
      <div className="mtb">
        <Navigation />
        <Component {...pageProps} />
      </div>
    </>
  )
}

export default MyApp

Non so se avete idee ? Ho seguito tailwind docs, ma a quanto pare non basta ahah

Thx