The hex color #21e93b is a light color. The web-safe version is Hex
#33FF33. A complementary color is
#DE16C4. The grayscale version is
#6C6C6C. A 20% lighter version of the original color is
#54FF6E, and Hex
#00B608 is the 20% darker color. If the color is saturated by 10%, you get
#19F536. If the color is desaturated by 10%, the color
#29DD40 is obtained.