The hex color #51B05D is a light color. The web-safe version is Hex
#669966. A complementary color is
#AE4FA2. The grayscale version is
#757575. A 20% lighter version of the original color is
#84E390, and Hex
#1E7D2A is the 20% darker color. If the color is saturated by 10%, you get
#4DB65B. If the color is desaturated by 10%, the color
#55AA5F is obtained.