The hex color #404a6f is a dark color. The web-safe version is Hex
#333366. A complementary color is
#BFB590. The grayscale version is
#535353. A 20% lighter version of the original color is
#737DA2, and Hex
#0D173C is the 20% darker color. If the color is saturated by 10%, you get
#3E4972. If the color is desaturated by 10%, the color
#424B6C is obtained.