The hex color #51996c is a dark color. The web-safe version is Hex
#669966. A complementary color is
#AE6693. The grayscale version is
#727272. A 20% lighter version of the original color is
#84CC9F, and Hex
#1E6639 is the 20% darker color. If the color is saturated by 10%, you get
#4E9D6B. If the color is desaturated by 10%, the color
#54956D is obtained.