The hex color #3f79c6 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C08639. The grayscale version is
#7F7F7F. A 20% lighter version of the original color is
#72ACF9, and Hex
#0C4693 is the 20% darker color. If the color is saturated by 10%, you get
#3978CD. If the color is desaturated by 10%, the color
#457ABF is obtained.