Change Model There Colour

It would be useful to be able to set Production Models header or background colour to something different to Test or other non-production Models. During development activities switching between models in different browser tabs and windows can lead to changing a formula in the wrong model. I've seen in other Finance Systems where you can change the RGB code of the background/page banner in system settings to easily differentiate between Test and Production environments.

I've attached an example of where I changed the banner colour using the A+ extension in Chrome to show the effect that could be used for Test models.