The hex color #3c78b5 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C3874A. The grayscale version is
#787878. A 20% lighter version of the original color is
#6FABE8, and Hex
#094582 is the 20% darker color. If the color is saturated by 10%, you get
#3678BB. If the color is desaturated by 10%, the color
#4278AF is obtained.