The hex color #c4d9df is a light color. The web-safe version is Hex
#CCCCCC. A complementary color is
#3B2620. The grayscale version is
#D4D4D4. A 20% lighter version of the original color is
#F7FFFF, and Hex
#91A6AC is the 20% darker color. If the color is saturated by 10%, you get
#C2DAE0. If the color is desaturated by 10%, the color
#C6D9DE is obtained.