Black background instead of bright white background. The brightness of the screen is torture for tired eyes.
That’s a very interesting idea, thank you! We’ll definitely give this a good thinking over–in the meantime, you can perhaps look into a 3rd party app for your computer that helps make looking at a screen easier, such as ‘f.lux’.
Yes please to an inverted colours option (which I've also mentioned as part of one of my suggestions).