The hex color #6f99e6 is a light color. The web-safe version is Hex
#6699FF. A complementary color is
#906619. The grayscale version is
#A5A5A5. A 20% lighter version of the original color is
#A2CCFF, and Hex
#3C66B3 is the 20% darker color. If the color is saturated by 10%, you get
#6A98ED. If the color is desaturated by 10%, the color
#749ADF is obtained.