Change Vertical Scrollbar Track Color

[WilliamFernsV3]

The workbench.colorCustomizations in user settings.json seems to only allow you to customize the scrollbar itself, not the track color behind it.

I tried using the "Custom CSS and JS Loader" extension, but the track is a canvas, meaning I cannot use CSS to modify the background color. I tried using JavaScript, but it does not seem to work:

var canvas = document.querySelector(".decorationsOverviewRuler");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "#FFFF00";