The hex color #c7e521 is a light color. The web-safe version is Hex
#CCCC33. A complementary color is
#381ADE. The grayscale version is
#9A9A9A. A 20% lighter version of the original color is
#FAFF54, and Hex
#94B200 is the 20% darker color. If the color is saturated by 10%, you get
#CCED15. If the color is desaturated by 10%, the color
#C2DD2D is obtained.