Hex triplets are one way to represent RGB colors and are commonly used to specify colors in CSS. Hex colors are prefixed with a “#” and typically include 6 hexadecimal digits (numbers 0–9 and letters A–F).^[1] Each pair of digits in the code represents the intensity of the colors red, green, and blue (RGB).

The format is #RRGGBB:

• RR: Red component (00 to FF)
• GG: Green component (00 to FF)
• BB: Blue component (00 to FF)

Here are some examples of hex color codes:

• Black: #000000
• White: #FFFFFF
• Red: #FF0000
• Green: #00FF00
• Blue: #0000FF
• Yellow: #FFFF00

In some cases, they may include a fourth pair of digits, which represent the color’s opacity or alpha. Sometimes, you may see 3-digit hex colors, with only one digit representing each RGB value.