rgb(red, green, blue)
Create color value from RGB components
@function rgb($red, $green, $blue, $alpha: 1.0)
Creates a color value out of the specified red, green and blue components. Any of the RGB components can be specified either as a percentage from 0 to 100 or as a plain number from 0 to 255.
Parameters
- red
Red color component - green
Green color component - blue
Blue color component - alpha (Optional)
Alpha color component. This parameter is optional, if it’s omitted, a value of1.0is used.
This parameter only accepts plain numbers in range0.0to1.0. 
Returns
A color value made of the specified RGB components.
Notes
- The 
rgbafunction is an alias forrgb. As such, they are identical functions. - The 
rgb(R G B[ / A])syntax is not supported. - The relative RGB color syntax (
rgb(from <color> R G B[ / A])) is not supported. 
Examples
@debug rgb(255 255 255); // => white
@debug rgb(0 50% 0); // => 007f00
@debug rgb(255 0 0); // => red
@debug rgb(255 0 0 0.5); // => #7fff0000