The hex color #ffdef0 is a light color. The web-safe version is Hex
#FFCCFF. A complementary color is
#00210F. The grayscale version is
#EFEFEF. A 20% lighter version of the original color is
#FFFFFF, and Hex
#CCABBD is the 20% darker color. If the color is saturated by 10%, you get
#FFDCF0. If the color is desaturated by 10%, the color
#FDE0F0 is obtained.