The hex color #3fde1d is a light color. The web-safe version is Hex
#33CC33. A complementary color is
#C021E2. The grayscale version is
#696969. A 20% lighter version of the original color is
#72FF50, and Hex
#0CAB00 is the 20% darker color. If the color is saturated by 10%, you get
#3BEA15. If the color is desaturated by 10%, the color
#43D225 is obtained.