The hex color #b7fc38 is a light color. The web-safe version is Hex
#CCFF33. A complementary color is
#4803C7. The grayscale version is
#A4A4A4. A 20% lighter version of the original color is
#EAFF6B, and Hex
#84C905 is the 20% darker color. If the color is saturated by 10%, you get
#B9FF2D. If the color is desaturated by 10%, the color
#B5F343 is obtained.