The hex color #f7f81b is a light color. The web-safe version is Hex
#FFFF33. A complementary color is
#0807E4. The grayscale version is
#AEAEAE. A 20% lighter version of the original color is
#FFFF4E, and Hex
#C4C500 is the 20% darker color. If the color is saturated by 10%, you get
#FEFF0C. If the color is desaturated by 10%, the color
#F0F12A is obtained.