In the summer, working late into the night, I feel most comfortable with my windows open and to avoid attracting insects, I set macOS to invert colors and also have Flux running. The effect is a red on black screen. My syntax color scheme is always set to black/grays, so that simply changes to different shades of red.

Flux, which is usually stylized as f.lux, is a third party application that automatically tints your screen amber at evening. Some people use it to be able to fall asleep more easily after work.

Unfortunately Flux on iOS requires a jailbroken device and Apple decided to switch off Flux’s built-in pendant called Night Shift when colors are inverted. So I’m looking forward that Dark Mode works with Night Shift to give me that submarine mode on iOS.