The hex color #305fcc is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#CFA033. The grayscale version is
#747474. A 20% lighter version of the original color is
#6392FF, and Hex
#002C99 is the 20% darker color. If the color is saturated by 10%, you get
#295DD5. If the color is desaturated by 10%, the color
#3761C3 is obtained.