The CSS colors module defines relative color syntax, which allows a CSS value to be defined relative to another color. This is a powerful feature that enables eAsy creation of complements to existing colors — such As lighter, darker, saturated, semi-transparent, or inverted variants — enabling more effective color palette creation....The CSS colors module defines relative color syntax, which allows a CSS <color> value to be defined relative to another color. This is a powerful feature that enables easy creation of complements to existing colors — such as lighter, darker, saturated, semi-transparent, or inverted variants — enabling more effective color palette creation.