The hex color #21ee8c is a light color. The web-safe version is Hex
#33FF99. A complementary color is
#DE1173. The grayscale version is
#898989. A 20% lighter version of the original color is
#54FFBF, and Hex
#00BB59 is the 20% darker color. If the color is saturated by 10%, you get
#17F88C. If the color is desaturated by 10%, the color
#2BE48C is obtained.