The hex color #b9cef9 is a light color. The web-safe version is Hex
#CCCCFF. A complementary color is
#463106. The grayscale version is
#D5D5D5. A 20% lighter version of the original color is
#ECFFFF, and Hex
#869BC6 is the 20% darker color. If the color is saturated by 10%, you get
#B6CDFD. If the color is desaturated by 10%, the color
#BCCFF5 is obtained.