The hex color #21e15e is a light color. The web-safe version is Hex
#33CC66. A complementary color is
#DE1EA1. The grayscale version is
#757575. A 20% lighter version of the original color is
#54FF91, and Hex
#00AE2B is the 20% darker color. If the color is saturated by 10%, you get
#19EC5C. If the color is desaturated by 10%, the color
#29D660 is obtained.