The hex color #28876c is a dark color. The web-safe version is Hex
#339966. A complementary color is
#D77893. The grayscale version is
#5E5E5E. A 20% lighter version of the original color is
#5BBA9F, and Hex
#005439 is the 20% darker color. If the color is saturated by 10%, you get
#238B6D. If the color is desaturated by 10%, the color
#2D836B is obtained.