Color Scheme - Select the standard color for items in your chart. You can use choose one of the 6 provided colors, or click CUSTOM to select a custom color.
Fill color - If you know the Hex value for the color you want to choose, enter it here.
Progress color - Progress can be displayed as a dark or light color over the taskbar. If you select Auto, Structure.Gantt will pick the option that provides the most contrast to your color scheme.