title: why do I get this error: 'postcss' is not recognized as an internal or external command, operable program or batch file, when I use tailwindcss
body: <p><a href="https://i.stack.imgur.com/Xfa4g.png" rel="nofollow noreferrer">enter image description here</a></p>
  <pre><code>PS C:\Users\Chidiebere\Desktop\bookmark reack landing page&gt; npm start
  </code></pre>
  <blockquote>
  <p>new@0.1.0 start
  npm run watch:css &amp;&amp; react-scripts start</p>
  </blockquote>
  <blockquote>
  <p>new@0.1.0 watch:css
  postcss src/assets/tailwind.css -o src/assets/main.css --watch</p>
  </blockquote>
  <p>'postcss' is not recognized as an internal or external command,
  operable program or batch file.
  PS C:\Users\Chidiebere\Desktop\bookmark reack landing page&gt; npm run build:css</p>
  <blockquote>
  <p>new@0.1.0 build:css
  postcss src/assets/tailwind.css -o src/assets/main.css</p>
  </blockquote>
  <p>'postcss' is not recognized as an internal or external command,
  operable program or batch file.
  PS C:\Users\Chidiebere\Desktop\bookmark reack landing page&gt;</p>