The hex color #51a376 is a light color. The web-safe version is Hex
#669966. A complementary color is
#AE5C89. The grayscale version is
#797979. A 20% lighter version of the original color is
#84D6A9, and Hex
#1E7043 is the 20% darker color. If the color is saturated by 10%, you get
#4DA776. If the color is desaturated by 10%, the color
#559F76 is obtained.