The hex color #6f99c5 is a light color. The web-safe version is Hex
#6699CC. A complementary color is
#90663A. The grayscale version is
#9A9A9A. A 20% lighter version of the original color is
#A2CCF8, and Hex
#3C6692 is the 20% darker color. If the color is saturated by 10%, you get
#6B99C9. If the color is desaturated by 10%, the color
#7399C1 is obtained.