The hex color #effe2d is a light color. The web-safe version is Hex
#FFFF33. A complementary color is
#1001D2. The grayscale version is
#B3B3B3. A 20% lighter version of the original color is
#FFFF60, and Hex
#BCCB00 is the 20% darker color. If the color is saturated by 10%, you get
#F5FF20. If the color is desaturated by 10%, the color
#E9F73A is obtained.