The hex color #effd76 is a light color. The web-safe version is Hex
#FFFF66. A complementary color is
#100289. The grayscale version is
#CBCBCB. A 20% lighter version of the original color is
#FFFFA9, and Hex
#BCCA43 is the 20% darker color. If the color is saturated by 10%, you get
#F3FF6D. If the color is desaturated by 10%, the color
#EBF87F is obtained.