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:
Background color - background color of the chart area
Border color - outline of the thermometer, or overall donut
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).
When the colors match, the goal chart does not appear to show any progress.