The hex color #3d54d5 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C2AB2A. The grayscale version is
#777777. A 20% lighter version of the original color is
#7087FF, and Hex
#0A21A2 is the 20% darker color. If the color is saturated by 10%, you get
#3750DE. If the color is desaturated by 10%, the color
#4358CC is obtained.