The hex color #3ddd4c is a light color. The web-safe version is Hex
#33CC33. A complementary color is
#C222B3. The grayscale version is
#777777. A 20% lighter version of the original color is
#70FF7F, and Hex
#0AAA19 is the 20% darker color. If the color is saturated by 10%, you get
#37E748. If the color is desaturated by 10%, the color
#43D350 is obtained.