title: Error: PostCSS plugin tailwindcss requires PostCSS 8
body: <p>I installed the new tailwindcss version 2.0 and I've got the following error. I tried to uninstall postcss and tailwindcss but it does not work. Need help.</p>
  <pre><code>
  Module build failed (from ./node_modules/postcss-loader/src/index.js):
  Error: PostCSS plugin tailwindcss requires PostCSS 8.
  Migration guide for end-users:
  https://github.com/postcss/postcss/wiki/PostCSS-8-for-end-users
      at Processor.normalize (/Users/niklas/Desktop/Privat/Projekte/nifoschool-frontend/node_modules/postcss-loader/node_modules/postcss/lib/processor.js:153:15)
      at new Processor (/Users/niklas/Desktop/Privat/Projekte/nifoschool-frontend/node_modules/postcss-loader/node_modules/postcss/lib/processor.js:56:25)
      at postcss (/Users/niklas/Desktop/Privat/Projekte/nifoschool-frontend/node_modules/postcss-loader/node_modules/postcss/lib/postcss.js:55:10)
      at /Users/niklas/Desktop/Privat/Projekte/nifoschool-frontend/node_modules/postcss-loader/src/index.js:140:12
  
   @ ./node_modules/vue-style-loader??ref--6-oneOf-1-0!./node_modules/css-loader/dist/cjs.js??ref--6-oneOf-1-1!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./node_modules/postcss-loader/src??ref--6-oneOf-1-2!./node_modules/cache-loader/dist/cjs.js??ref--0-0!./node_modules/vue-loader/lib??vue-loader-options!./src/components/util/SlideInfo.vue?vue&amp;type=style&amp;index=0&amp;lang=css&amp; 4:14-393 14:3-18:5 15:22-401
   @ ./src/components/util/SlideInfo.vue?vue&amp;type=style&amp;index=0&amp;lang=css&amp;
   @ ./src/components/util/SlideInfo.vue
   @ ./node_modules/cache-loader/dist/cjs.js??ref--12-0!./node_modules/babel-loader/lib!./node_modules/cache-loader/dist/cjs.js??ref--0-0!./node_modules/vue-loader/lib??vue-loader-options!./src/views/Grades.vue?vue&amp;type=script&amp;lang=js&amp;
   @ ./src/views/Grades.vue?vue&amp;type=script&amp;lang=js&amp;
   @ ./src/views/Grades.vue
   @ ./src/router/index.js
   @ ./src/main.js
   @ multi (webpack)-dev-server/client?http://172.20.12.3:8081&amp;sockPath=/sockjs-node (webpack)/hot/dev-server.js ./src/main.js
  </code></pre>
  <p>Here is my package.json</p>
  <pre><code>  &quot;name&quot;: &quot;nifo-school&quot;,
    &quot;version&quot;: &quot;0.1.0&quot;,
    &quot;private&quot;: true,
    &quot;scripts&quot;: {
      &quot;serve&quot;: &quot;vue-cli-service serve&quot;,
      &quot;build&quot;: &quot;vue-cli-service build&quot;,
      &quot;lint&quot;: &quot;vue-cli-service lint&quot;,
      &quot;electron:build&quot;: &quot;vue-cli-service electron:build&quot;,
      &quot;electron:serve&quot;: &quot;vue-cli-service electron:serve&quot;,
      &quot;postinstall&quot;: &quot;electron-builder install-app-deps&quot;,
      &quot;postuninstall&quot;: &quot;electron-builder install-app-deps&quot;
    },
    &quot;main&quot;: &quot;background.js&quot;,
    &quot;dependencies&quot;: {
      &quot;react&quot;: &quot;^16.3.0&quot;,
      &quot;@ivanv/vue-collapse-transition&quot;: &quot;^0.2.1&quot;,
      &quot;autoprefixer&quot;: &quot;^10.0.2&quot;,
      &quot;axios&quot;: &quot;^0.21.0&quot;,
      &quot;core-js&quot;: &quot;^3.6.5&quot;,
      &quot;electron&quot;: &quot;^8.0.0&quot;,
      &quot;electron-drag&quot;: &quot;^2.0.0&quot;,
      &quot;jquery&quot;: &quot;^3.5.1&quot;,
      &quot;js-cookie&quot;: &quot;^2.2.1&quot;,
      &quot;postcss-cli&quot;: &quot;^=8.0&quot;,
      &quot;react-collapse&quot;: &quot;^5.0.1&quot;,
      &quot;summernote&quot;: &quot;^0.8.18&quot;,
      &quot;tailwindcss&quot;: &quot;^2.0.1&quot;,
      &quot;v-click-outside&quot;: &quot;^3.1.2&quot;,
      &quot;vue&quot;: &quot;^2.6.11&quot;,
      &quot;vue-html-editor&quot;: &quot;^0.2.1&quot;,
      &quot;vue-i18n&quot;: &quot;^8.22.1&quot;,
      &quot;vue-router&quot;: &quot;^3.2.0&quot;,
      &quot;vue2-editor&quot;: &quot;^2.10.2&quot;,
      &quot;vuex&quot;: &quot;^3.5.1&quot;
    },
    &quot;devDependencies&quot;: {
      &quot;@vue/cli-plugin-babel&quot;: &quot;~4.5.0&quot;,
      &quot;@vue/cli-plugin-eslint&quot;: &quot;~4.5.0&quot;,
      &quot;@vue/cli-plugin-router&quot;: &quot;~4.5.0&quot;,
      &quot;@vue/cli-service&quot;: &quot;~4.5.0&quot;,
      &quot;@vue/eslint-config-airbnb&quot;: &quot;^5.0.2&quot;,
      &quot;babel-eslint&quot;: &quot;^10.1.0&quot;,
      &quot;electron-devtools-installer&quot;: &quot;^3.1.0&quot;,
      &quot;eslint&quot;: &quot;^6.7.2&quot;,
      &quot;eslint-plugin-import&quot;: &quot;^2.20.2&quot;,
      &quot;eslint-plugin-vue&quot;: &quot;^6.2.2&quot;,
      &quot;lint-staged&quot;: &quot;^9.5.0&quot;,
      &quot;node-sass&quot;: &quot;^4.12.0&quot;,
      &quot;postcss&quot;: &quot;^=8.1&quot;,
      &quot;sass-loader&quot;: &quot;^8.0.2&quot;,
      &quot;vue-cli-plugin-electron-builder&quot;: &quot;~2.0.0-rc.4&quot;,
      &quot;vue-template-compiler&quot;: &quot;^2.6.11&quot;
    },
    &quot;gitHooks&quot;: {
      &quot;pre-commit&quot;: &quot;lint-staged&quot;
    },
    &quot;lint-staged&quot;: {
      &quot;*.{js,jsx,vue}&quot;: [
        &quot;vue-cli-service lint&quot;,
        &quot;git add&quot;
      ]
    }
  }```
  
  
  Thanks for help
  </code></pre>