The hex color #40a90a is a dark color. The web-safe version is Hex
#339900. A complementary color is
#BF56F5. The grayscale version is
#515151. A 20% lighter version of the original color is
#73DC3D, and Hex
#0D7600 is the 20% darker color. If the color is saturated by 10%, you get
#3EB203. If the color is desaturated by 10%, the color
#42A011 is obtained.