Left off exactly here: https://youtu.be/oTUDt78qkiM

The gist file is here: https://gist.github.com/Richard-Burd

The given path is this:

<script src="https://gist.github.com/Richard-Burd/1554b4f94639c3a69f4c4b58f1ee4f3d.js"></script>

The tutorial wants s.thing like this: https://gist.githubusercontent.com/Richard-Burd/1554b4f94639c3a69f4c4b58f1ee4f3d/raw/cssNamedColors.csv