The hex color #e3f5f2 is a light color. The web-safe version is Hex
#CCFFFF. A complementary color is
#1C0A0D. The grayscale version is
#EEEEEE. A 20% lighter version of the original color is
#FFFFFF, and Hex
#B0C2BF is the 20% darker color. If the color is saturated by 10%, you get
#E2F6F2. If the color is desaturated by 10%, the color
#E4F4F2 is obtained.