The hex color #c3e9ed is a light color. The web-safe version is Hex
#CCFFFF. A complementary color is
#3C1612. The grayscale version is
#DEDEDE. A 20% lighter version of the original color is
#F6FFFF, and Hex
#90B6BA is the 20% darker color. If the color is saturated by 10%, you get
#C0EAEF. If the color is desaturated by 10%, the color
#C6E8EB is obtained.