RGB color codes are a set of numerical values that represent the intensity of red, green, and blue light in a color. These values range from 0 to 255, where 0 represents the minimum intensity and 255 represents the maximum intensity. By combining different intensities of red, green, and blue light, we can create a wide range of colors.

: Combining all three at 255 creates White ( 255, 255, 255 ), while setting all to 0 creates Black ( 0, 0, 0 ).

In the CodeHS editor, you will likely apply these in your CSS file. If the exercise asks you to make a "Hot" header, your code might look like this: