Workspace > Events > Event Pages, Event Settings step, Page Content & Display Options section.
On the Style Event Page step, the following settings apply to the goal chart as follows:
Body
Background color - background color of the chart area
Border color - outline of the thermometer, or overall donut
Header
Background color - progress inside the thermometer or donut, and amount raised
NOTE: The Style Event Page must be saved in order to see the goal chart update(s).
Examples
Thermometer
Donut
When the colors match, the goal chart does not appear to show any progress.