The hex color #00311a is a dark color. The web-safe version is Hex
#003333. A complementary color is
#FFCEE5. The grayscale version is
#191919. A 20% lighter version of the original color is
#33644D, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#00331A. If the color is desaturated by 10%, the color
#032F1A is obtained.