When you create your Ouvvi environment you may wish to customise your instances so that they can be easily recognisable at a glance.
This may be done to distinguish between DEV/PROD/UAT environments, so that users work on the correct environment.
To change the colour of the instance go to
System Settings >
Visual UI Theme and then select the theme you wish to apply from the drop down.
Then to save your changes scroll to the bottom of the page and click