To change the colors on your Tree Map, select "Manage" from the navigation bar at the top and then click on "General" in the Administration menu on the left. Choose "Branding".
Click "Edit" in the top right. You can set Primary and Secondary colors for your Tree Map by typing in the hex value of a specific color or by using the color picker. Changing these colors will affect some of the text and buttons on your Tree Map.
When you are satisfied with your colors, remember to click "Save" in the top right.