The hex color #f9f40f is a light color. The web-safe version is Hex
#FFFF00. A complementary color is
#060BF0. The grayscale version is
#A9A9A9. A 20% lighter version of the original color is
#FFFF42, and Hex
#C6C100 is the 20% darker color. If the color is saturated by 10%, you get
#FFFB00. If the color is desaturated by 10%, the color
#F1ED1E is obtained.