title: How to Inject CSS or JavaScript to SharePoint Modern page using SPFX
body: <p>I have implemented the SPFX extension to inject CSS and JS to Sharepoint modern page. I could able to deploy it on-site without any error. But it is rendering my custom CSS and script</p>
  <p>How to debug it to see where is the issue?</p>
  <p>I have referred to this link to implement it: <a href="https://github.com/hugoabernier/react-application-injectcss" rel="nofollow noreferrer">https://github.com/hugoabernier/react-application-injectcss</a></p>