The hex color #d3f9f4 is a light color. The web-safe version is Hex
#CCFFFF. A complementary color is
#2C060B. The grayscale version is
#EBEBEB. A 20% lighter version of the original color is
#FFFFFF, and Hex
#A0C6C1 is the 20% darker color. If the color is saturated by 10%, you get
#D1FAF5. If the color is desaturated by 10%, the color
#D5F8F3 is obtained.