The hex color #4cde21 is a light color. The web-safe version is Hex
#33CC33. A complementary color is
#B321DE. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#7FFF54, and Hex
#19AB00 is the 20% darker color. If the color is saturated by 10%, you get
#49E919. If the color is desaturated by 10%, the color
#4FD329 is obtained.