The hex color #66f33d is a light color. The web-safe version is Hex
#66FF33. A complementary color is
#990CC2. The grayscale version is
#878787. A 20% lighter version of the original color is
#99FF70, and Hex
#33C00A is the 20% darker color. If the color is saturated by 10%, you get
#63FE36. If the color is desaturated by 10%, the color
#69E844 is obtained.