How to change color of sidebar scroll indicator

I’m new to Webflow, and have a question about changing color of sidebar scroll indicator. I cloned a project I really like but I’m unable to pinpoint how to change the color of sidebar scroll indicator.

Here is my public share link: https://showcasesearch.webflow.io/projects/https-webflow-com-website-spruce-rapid-rfsn-1495911-39ce0