There will be no visually unpleasing elements such as colour combinations that strain the eyes.
This needs to be measurable, same for your other requirements, maybe you could write something about having a constant style and using darker colours to ensure this requirement.
There will be no visually unpleasing elements such as colour combinations that strain the eyes.
This needs to be measurable, same for your other requirements, maybe you could write something about having a constant style and using darker colours to ensure this requirement.