The hex color #51825c is a dark color. The web-safe version is Hex
#669966. A complementary color is
#AE7DA3. The grayscale version is
#656565. A 20% lighter version of the original color is
#84B58F, and Hex
#1E4F29 is the 20% darker color. If the color is saturated by 10%, you get
#4F855B. If the color is desaturated by 10%, the color
#537F5D is obtained.