Friends were talking about the new gradient added to the progress bar on Youtube videos.
I used inspect element to see if it could be disabled. Turns out you can just set it to whatever color you want.
You can use a CSS addon (i.e. User CSS for Chrome, CustomCSS Injector for Firefox) to make it permanent.
Not trans myself, but it's very nifty for pride colors :3
Just copy/paste this into a CSS addon and change the RGB hex codes to whatever color you want
ytp-cairo-refresh-signature-moments .ytp-play-progress {background: linear-gradient(to right, #5bcefa 0%, #5bcefa 20%, #f5a9b8 20.01%, #f5a9b8 40%, #ffffff 40.01%, #ffffff 60%, #f5a9b8 60.01%, #f5a9b8 80%, #5bcefa 80.01%, #5bcefa 100% );}