TL;DR: YES!


Tap into your custom CSS knowledge and edit the browser source to match your look and feel. 


In OBS when you add (or edit) the browser source properties there is an area for custom CSS.

Adding the following will make various element colors editable:

Progress bar:

Progress bar's fill color: .progress-bar{background: #FFF !important;} editing the #FFF part will change the color.
Progress bar background: .progress-bar-background{background: #FFF !important;} editing the #FFF part will change the color.

Text color:
All text color to be the same: .dashboard-wrapper, .label{ color: #FFF !important;} editing the #FFF part will change the color.
Main text: .dashboard-wrapper{ color: #FFF !important;} editing the #FFF part will change the color.
Label text: .label{ color: #FFF !important;} editing the #FFF part will change the color.

Background color:

 .dashboard-wrapper{background: #FFF !important;} editing the #FFF part will change the color.



For the color options, they can use:
- RGB
- RGBA
- Hex codes
- Gradients (background only without getting too technical. This is Progress bar fill & background, and main background color