The colors of the scrollbar and its thumb are too close for me, making it difficult to discern the thumb. How can I change this?

The posts on this forum seem to be all for either ST2 or an earlier version of ST3 where you used either a png file for the thumb, or the theme files were diferent - something that looks like json whereas now you are using xml. I did find the Color Schemes doc at docs.sublimetext.info/en/latest/ … hemes.html but it doesn’t have anything that sees like it could affect the thumb or scrollbar color.

thanks,
greg