The hex color #EFF3E2 is a light color. The web-safe version is Hex
#FFFFCC. A complementary color is
#100C1D. The grayscale version is
#ECECEC. A 20% lighter version of the original color is
#FFFFFF, and Hex
#BCC0AF is the 20% darker color. If the color is saturated by 10%, you get
#EFF4E1. If the color is desaturated by 10%, the color
#EFF2E3 is obtained.