The hex color #d3d9f4 is a light color. The web-safe version is Hex
#CCCCFF. A complementary color is
#2C260B. The grayscale version is
#E0E0E0. A 20% lighter version of the original color is
#FFFFFF, and Hex
#A0A6C1 is the 20% darker color. If the color is saturated by 10%, you get
#D2D8F6. If the color is desaturated by 10%, the color
#D4DAF2 is obtained.