The hex color #000231 is a dark color. The web-safe version is Hex
#000033. A complementary color is
#FFFDCE. The grayscale version is
#111111. A 20% lighter version of the original color is
#333564, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#000134. If the color is desaturated by 10%, the color
#02042E is obtained.