The hex color #66bccd is a light color. The web-safe version is Hex
#66CCCC. A complementary color is
#994332. The grayscale version is
#A5A5A5. A 20% lighter version of the original color is
#99EFFF, and Hex
#33899A is the 20% darker color. If the color is saturated by 10%, you get
#60BED1. If the color is desaturated by 10%, the color
#6CBAC9 is obtained.