Yair Even Or has a neat project called Knobs that adds UI controls that adjust CSS Custom Properties instantly any way you need them to. There is more to the project than that, but that’s how we use them here to control some generative art.

Links from video:

• dat.gui is still cool (CodePen blog post) (Example Pen using it).
• knobs is what we used. (CodePen blog post) (Example Pen using it).

Never did fix that issue with the second color not working right. If anyone knows, hit us up.