The hex color #f3d91f is a light color. The web-safe version is Hex
#FFCC33. A complementary color is
#0C26E0. The grayscale version is
#A4A4A4. A 20% lighter version of the original color is
#FFFF52, and Hex
#C0A600 is the 20% darker color. If the color is saturated by 10%, you get
#FBDE12. If the color is desaturated by 10%, the color
#EBD42C is obtained.