The hex color #e8e40e is a light color. The web-safe version is Hex
#FFCC00. A complementary color is
#171BF1. The grayscale version is
#9E9E9E. A 20% lighter version of the original color is
#FFFF41, and Hex
#B5B100 is the 20% darker color. If the color is saturated by 10%, you get
#EFEB00. If the color is desaturated by 10%, the color
#E1DD1C is obtained.