title: Property scrollbar-width doesn't exist : none error
body: <p>I want to hide the scrollbar in Firefox Browser so i used the following in css:
  <code>scrollbar-width: none;</code>
  when i validate the css file in W3C css validator it shows me the following error:</p>
  <blockquote>
  <p>Property scrollbar-width doesn't exist : none</p>
  </blockquote>
  <p>how to fix this error?</p>