The hex color #d9f55c is a light color. The web-safe version is Hex
#CCFF66. A complementary color is
#260AA3. The grayscale version is
#B9B9B9. A 20% lighter version of the original color is
#FFFF8F, and Hex
#A6C229 is the 20% darker color. If the color is saturated by 10%, you get
#DCFB53. If the color is desaturated by 10%, the color
#D6EF65 is obtained.