The hex color #dfef55 is a light color. The web-safe version is Hex
#CCFF66. A complementary color is
#2010AA. The grayscale version is
#B6B6B6. A 20% lighter version of the original color is
#FFFF88, and Hex
#ACBC22 is the 20% darker color. If the color is saturated by 10%, you get
#E3F54B. If the color is desaturated by 10%, the color
#DBE95F is obtained.