Colours in web and print work live in different worlds. Understanding which format to use — and when — saves you from mysterious colour shifts between your design tool and the browser.

HEX: The Web Default

Hex codes like #2f855a encode red, green, and blue as two hexadecimal digits each (00–FF = 0–255). Three pairs, 16 million possible colours.

color: #2f855a; /* 6-digit hex */

color: #2f855a80; /* 8-digit hex with alpha (80 = 50% opacity) */