The hex color #f5f81f is a light color. The web-safe version is Hex
#FFFF33. A complementary color is
#0A07E0. The grayscale version is
#AFAFAF. A 20% lighter version of the original color is
#FFFF52, and Hex
#C2C500 is the 20% darker color. If the color is saturated by 10%, you get
#FCFF11. If the color is desaturated by 10%, the color
#EEF12D is obtained.