The hex color #51a476 is a light color. The web-safe version is Hex
#669966. A complementary color is
#AE5B89. The grayscale version is
#797979. A 20% lighter version of the original color is
#84D7A9, and Hex
#1E7143 is the 20% darker color. If the color is saturated by 10%, you get
#4DA876. If the color is desaturated by 10%, the color
#55A076 is obtained.