The hex color #57ef03 is a light color. The web-safe version is Hex
#66FF00. A complementary color is
#A810FC. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#8AFF36, and Hex
#24BC00 is the 20% darker color. If the color is saturated by 10%, you get
#55FC00. If the color is desaturated by 10%, the color
#59E20E is obtained.