About Hexadecimal Colors
Hexadecimal colors are based on the red, green, blue color model. Each color consists of a mixture of red, green, and blue that is numerically represented by a set of three numbers, each in the range of 0 to 255. Each of the three numbers represents the intensity of the respective colors, with 255 representing 100% intensity.
The three numbers are converted into hexadecimal and put together in a string of six characters that is preceded by a #.