Computer monitors and device screens create different colors by combining amounts of red, green, and blue light.
Known as the RGB additive color model in modern color theory.
Mixing two primary colors creates the secondary colors cyan (G + B), magenta (R + B) and yellow (R + G).
These secondary colors happen to be the complement to the primary color not used in their creation, and are opposite to that primary color on the color wheel.
Tertiary colors are the result of combining a primary color with one of its secondary color neighbors.
One way to select colors that result in a harmonious combination is the split-complemenary color scheme.
starts with a base color, then pairs it with the two colors that are adjacent to its complement.