In next nightly, currently one doesn't have new CSS rules

4

This would be fine as long as the logo and the light background added used no more than say 10% of the default area of display on a typical desktop/laptop screen. There is nothing worse than having everything dark and using your computer in a dim or dark area and then switching to an application or web page where suddenly most of the screen is bright/light. It feels like someone just shot a laser beam into your eyes (which considering that most screens are now OLED, isn't far from the truth).