The hex color #3fc80f is a light color. The web-safe version is Hex
#33CC00. A complementary color is
#C037F0. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#72FB42, and Hex
#0C9500 is the 20% darker color. If the color is saturated by 10%, you get
#3CD307. If the color is desaturated by 10%, the color
#42BD17 is obtained.