The hex color #31e90c is a light color. The web-safe version is Hex
#33FF00. A complementary color is
#CE16F3. The grayscale version is
#626262. A 20% lighter version of the original color is
#64FF3F, and Hex
#00B600 is the 20% darker color. If the color is saturated by 10%, you get
#2CF703. If the color is desaturated by 10%, the color
#36DC15 is obtained.