The hex color #3ddd2c is a light color. The web-safe version is Hex
#33CC33. A complementary color is
#C222D3. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#70FF5F, and Hex
#0AAA00 is the 20% darker color. If the color is saturated by 10%, you get
#38E826. If the color is desaturated by 10%, the color
#42D232 is obtained.