The hex color #21B05C is a dark color. The web-safe version is Hex
#339966. A complementary color is
#DE4FA3. The grayscale version is
#646464. A 20% lighter version of the original color is
#54E38F, and Hex
#007D29 is the 20% darker color. If the color is saturated by 10%, you get
#1AB85B. If the color is desaturated by 10%, the color
#28A85D is obtained.