Hex colors are a way of specifying colors using a combination of six hexadecimal digits. The digits represent the red, green, and blue color channels, similar to the RGB color model.
In the hex color code, the first two digits represent the red color channel, the next two digits represent the green color channel, and the last two digits represent the blue color channel. Each color channel can have a value from 00 to FF (in hexadecimal notation), which corresponds to a value of 0 to 255 in decimal notation.
#FFFFFF represents white color, since all three colors are at full intensity, #000000 represents black color since all colors are at 0 intensity.