The hex color #ffde3e is a light color. The web-safe version is Hex
#FFCC33. A complementary color is
#0021C1. The grayscale version is
#B4B4B4. A 20% lighter version of the original color is
#FFFF71, and Hex
#CCAB0B is the 20% darker color. If the color is saturated by 10%, you get
#FFE232. If the color is desaturated by 10%, the color
#F7DA4A is obtained.