The hex color #31a51a is a dark color. The web-safe version is Hex
#339933. A complementary color is
#CE5AE5. The grayscale version is
#505050. A 20% lighter version of the original color is
#64D84D, and Hex
#007200 is the 20% darker color. If the color is saturated by 10%, you get
#2EAE15. If the color is desaturated by 10%, the color
#349D1F is obtained.