The hex color #66a8fe is a light color. The web-safe version is Hex
#6699FF. A complementary color is
#995701. The grayscale version is
#AFAFAF. A 20% lighter version of the original color is
#99DBFF, and Hex
#3375CB is the 20% darker color. If the color is saturated by 10%, you get
#5FA7FF. If the color is desaturated by 10%, the color
#6DA9F6 is obtained.