The hex color #f5fb3e is a light color. The web-safe version is Hex
#FFFF33. A complementary color is
#0A04C1. The grayscale version is
#BABABA. A 20% lighter version of the original color is
#FFFF71, and Hex
#C2C80B is the 20% darker color. If the color is saturated by 10%, you get
#FBFF32. If the color is desaturated by 10%, the color
#EFF54A is obtained.