The hex color #e3e7f3 is a light color. The web-safe version is Hex
#CCFFFF. A complementary color is
#1C180C. The grayscale version is
#EAEAEA. A 20% lighter version of the original color is
#FFFFFF, and Hex
#B0B4C0 is the 20% darker color. If the color is saturated by 10%, you get
#E2E7F4. If the color is desaturated by 10%, the color
#E4E7F2 is obtained.