The hex color #31912c is a dark color. The web-safe version is Hex
#339933. A complementary color is
#CE6ED3. The grayscale version is
#4F4F4F. A 20% lighter version of the original color is
#64C45F, and Hex
#005E00 is the 20% darker color. If the color is saturated by 10%, you get
#2E9828. If the color is desaturated by 10%, the color
#348A30 is obtained.