The hex color #c4ffef is a light color. The web-safe version is Hex
#CCFFFF. A complementary color is
#3B0010. The grayscale version is
#E6E6E6. A 20% lighter version of the original color is
#F7FFFF, and Hex
#91CCBC is the 20% darker color. If the color is saturated by 10%, you get
#C1FFF0. If the color is desaturated by 10%, the color
#C7FDEE is obtained.