The hex color #e7f3e3 is a light color. The web-safe version is Hex
#FFFFCC. A complementary color is
#180C1C. The grayscale version is
#EAEAEA. A 20% lighter version of the original color is
#FFFFFF, and Hex
#B4C0B0 is the 20% darker color. If the color is saturated by 10%, you get
#E7F4E2. If the color is desaturated by 10%, the color
#E7F2E4 is obtained.