The hex color #66a10f is a dark color. The web-safe version is Hex
#669900. A complementary color is
#995EF0. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#99D442, and Hex
#336E00 is the 20% darker color. If the color is saturated by 10%, you get
#67A807. If the color is desaturated by 10%, the color
#659A17 is obtained.