# RGB color

A color mixed from red, green and blue, 0-255 each.

## What is an **RGB color**?

An **RGB color** mixes red, green and blue, each from 0 to 255. An optional fourth value sets transparency.

```css
.overlay { background: rgb(0 0 0 / 50%); }   /* black, half see-through */
.brand { color: rgb(0, 120, 212); }
```

Level: Novice · [More CSS terms at this level](https://www.ask-codey.com/glossary/subjects/css/novice)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/rgb-color