The hex color #21ad3c is a dark color. The web-safe version is Hex
#339933. A complementary color is
#DE52C3. The grayscale version is
#595959. A 20% lighter version of the original color is
#54E06F, and Hex
#007A09 is the 20% darker color. If the color is saturated by 10%, you get
#1BB539. If the color is desaturated by 10%, the color
#27A53F is obtained.