Documentation
Third Party Customization from Aurora Ed Tech (AET)
https://www.auroraedtech.com/plugins-all/powersource/101-test-server-identification
This plugin gives an administrator the ability to set key display properties in a simple interface. These attributes can be used to make it more apparent to the end user that the current session is on a test or development environment.
The display changes include: page background, replacing the PowerSchool logo with any text, prepending page titles with a string, and adding custom messages to the portal login pages. Background colors can be chosen from a palette or typed with HTML color codes.