(rgb: 255, 0, 47)produces a colour with 255 red, 0 blue and 47 green.
(rgb: 90, 0, 0)'s rproduces the number 90.
The RGB additive colour model is commonly used for defining colours: the HTML hexadecimal notation for colours (such as #9263AA) simply consists of three hexadecimal values placed together. This macro allows you to create such colours computationally, by providing variables for certain components.
This macro takes the same range of numbers as the CSS
Giving values higher than 255 or lower than 0, or with a fractional part, will cause an error.