The hex color #c3cfef is a light color. The web-safe version is Hex
#CCCCFF. A complementary color is
#3C3010. The grayscale version is
#D6D6D6. A 20% lighter version of the original color is
#F6FFFF, and Hex
#909CBC is the 20% darker color. If the color is saturated by 10%, you get
#C1CEF2. If the color is desaturated by 10%, the color
#C5D0EC is obtained.