Custom scrollbar creation

This code is not working ,I am creating a custom scrollbar for the website using CSS using visual code studio,any suggestions:

          width: 10px;
          color: blue;
          color: greenyellow;

You’re going to need to expand on the problem if you want anyone to be able to help you. I’m not a webkit expert by any means, but this works (roughly) on my Chrome browser. Remember that things like webkit buttons are hidden by default on some browsers too.

This might be a daft question, but you are testing this on a browser which supports the webkit prefix aren’t you?