The hex color #51955c is a dark color. The web-safe version is Hex
#669966. A complementary color is
#AE6AA3. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#84C88F, and Hex
#1E6229 is the 20% darker color. If the color is saturated by 10%, you get
#4E995A. If the color is desaturated by 10%, the color
#54915E is obtained.