How to add custom CSS in a block theme

If you need to add some extra customization to your website, you can do so using custom CSS. Luckily, the WordPress site editor includes a built-in option for this which you can locate by following these steps:

  1. Go to the backend of your website;
  2. Open up the Editor interface found under Appearance;
    Open the WordPress site editor
  3. Click on the preview image and the click on the icon for the Styles interface:Finding the WordPress styles interface in the new site editor
  4. In the panel that opens up, click on the three dots and then click on Additional CSS:
  5. Add your custom CSS.