The hex color #eff3b5 is a light color. The web-safe version is Hex
#FFFFCC. A complementary color is
#100C4A. The grayscale version is
#DDDDDD. A 20% lighter version of the original color is
#FFFFE8, and Hex
#BCC082 is the 20% darker color. If the color is saturated by 10%, you get
#F1F5B1. If the color is desaturated by 10%, the color
#EDF1B9 is obtained.