The hex color #51d46c is a light color. The web-safe version is Hex
#66CC66. A complementary color is
#AE2B93. The grayscale version is
#868686. A 20% lighter version of the original color is
#84FF9F, and Hex
#1EA139 is the 20% darker color. If the color is saturated by 10%, you get
#4CDC69. If the color is desaturated by 10%, the color
#56CC6F is obtained.