The hex color #a3d51a is a light color. The web-safe version is Hex
#99CC33. A complementary color is
#5C2AE5. The grayscale version is
#868686. A 20% lighter version of the original color is
#D6FF4D, and Hex
#70A200 is the 20% darker color. If the color is saturated by 10%, you get
#A6DD0F. If the color is desaturated by 10%, the color
#A0CD25 is obtained.