So rgb stands for Red, Green, Blue values, the three primary colors that make up every other color. Their values range from 0 up to 255 for each. So rgb(255,0,0) is 255 worth of red, for lack of a better way to explain, 0 of green, and 0 of blue. So the color will be Bright Red. CSS accepts color name such as “red” and also rgb values, which are formatted as (red#, green#, blue#) (and also HEX#s but you’ll get to there later).