The hex color #31235d is a dark color. The web-safe version is Hex
#333366. A complementary color is
#CEDCA2. The grayscale version is
#3B3B3B. A 20% lighter version of the original color is
#645690, and Hex
#00002A is the 20% darker color. If the color is saturated by 10%, you get
#302160. If the color is desaturated by 10%, the color
#32255A is obtained.