Assistance Needed for Changing Progress Bar Color in Timeline13 Integration

Hello ! I'm integrating Timeline13 into my site. I have a problem with the color change of the progressbar. I did change the base color, but I managed to change the color of the circles. When I scroll, I'd like the color (of the progressbar) to change to my primary color (dark red). I don't know where to look, I imagine the solution is as simple as that, but I can't find it. Here's the preview link, if you can help me https://preview.webflow.com/preview/new-klsta-2025?utm_medium=preview_link&utm_source=[…]&pageId=676c23a42dbaf97bee50c4b3&locale=fr&workflow=preview