The hex color #3fbd1c is a light color. The web-safe version is Hex
#33CC33. A complementary color is
#C042E3. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#72F04F, and Hex
#0C8A00 is the 20% darker color. If the color is saturated by 10%, you get
#3CC715. If the color is desaturated by 10%, the color
#42B323 is obtained.