The hex color #3f73cd is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C08C32. The grayscale version is
#808080. A 20% lighter version of the original color is
#72A6FF, and Hex
#0C409A is the 20% darker color. If the color is saturated by 10%, you get
#3972D5. If the color is desaturated by 10%, the color
#4574C5 is obtained.