The hex color #a3f21c is a light color. The web-safe version is Hex
#99FF33. A complementary color is
#5C0DE3. The grayscale version is
#909090. A 20% lighter version of the original color is
#D6FF4F, and Hex
#70BF00 is the 20% darker color. If the color is saturated by 10%, you get
#A5FC10. If the color is desaturated by 10%, the color
#A1E828 is obtained.