The hex color #a9c9e3 is a light color. The web-safe version is Hex
#99CCCC. A complementary color is
#56361C. The grayscale version is
#C7C7C7. A 20% lighter version of the original color is
#DCFCFF, and Hex
#7696B0 is the 20% darker color. If the color is saturated by 10%, you get
#A6C9E6. If the color is desaturated by 10%, the color
#ACC9E0 is obtained.