The hex color #3fe43f is a light color. The web-safe version is Hex
#33CC33. A complementary color is
#C01BC0. The grayscale version is
#767676. A 20% lighter version of the original color is
#72FF72, and Hex
#0CB10C is the 20% darker color. If the color is saturated by 10%, you get
#3AEF3A. If the color is desaturated by 10%, the color
#45D945 is obtained.