The hex color #3c99c9 is a light color. The web-safe version is Hex
#3399CC. A complementary color is
#C36636. The grayscale version is
#8A8A8A. A 20% lighter version of the original color is
#6FCCFC, and Hex
#096696 is the 20% darker color. If the color is saturated by 10%, you get
#349BCF. If the color is desaturated by 10%, the color
#4498C3 is obtained.