The hex color #efc33c is a light color. The web-safe version is Hex
#FFCC33. A complementary color is
#103CC3. The grayscale version is
#A5A5A5. A 20% lighter version of the original color is
#FFF66F, and Hex
#BC9009 is the 20% darker color. If the color is saturated by 10%, you get
#F6C632. If the color is desaturated by 10%, the color
#E8C046 is obtained.