Light-on-dark color scheme, also called dark mode, dark theme or night mode, is a color scheme that uses light-colored text, icons, and graphical user interface elements on a dark background and is often discussed in terms of computer user interface design and web design.
The phosphor was normally a very dark color, and lit up brightly when the electron beam hit it, appearing to be green or amber on black, depending on phosphors applied on a monochrome screen.
With the advent of teletext, research was done into which primary and secondary light colors and combinations worked best for this new medium. Cyan or yellow on black was typically found to be optimal from a palette of black, red, green, yellow, blue, magenta, cyan and white.
The opposite color scheme, dark-on-light color scheme, was originally introduced in WYSIWYG word processors, to simulate ink on paper.
Whether it is easier or healthier to read text on a dark background was disputed by vision and perception researchers; there was similar dispute between users. and max white uses roughly six times as much power as max black on a Google Pixel .
