The hex color #d4f3e3 is a light color. The web-safe version is Hex
#CCFFCC. A complementary color is
#2B0C1C. The grayscale version is
#E3E3E3. A 20% lighter version of the original color is
#FFFFFF, and Hex
#A1C0B0 is the 20% darker color. If the color is saturated by 10%, you get
#D2F5E3. If the color is desaturated by 10%, the color
#D6F1E3 is obtained.