The hex color #51ec0c is a light color. The web-safe version is Hex
#66FF00. A complementary color is
#AE13F3. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#84FF3F, and Hex
#1EB900 is the 20% darker color. If the color is saturated by 10%, you get
#4EF902. If the color is desaturated by 10%, the color
#54DF16 is obtained.