The hex color #21c94c is a light color. The web-safe version is Hex
#33CC33. A complementary color is
#DE36B3. The grayscale version is
#676767. A 20% lighter version of the original color is
#54FC7F, and Hex
#009619 is the 20% darker color. If the color is saturated by 10%, you get
#1AD349. If the color is desaturated by 10%, the color
#28BF4F is obtained.