The hex color #40457c is a dark color. The web-safe version is Hex
#333366. A complementary color is
#BFBA83. The grayscale version is
#565656. A 20% lighter version of the original color is
#7378AF, and Hex
#0D1249 is the 20% darker color. If the color is saturated by 10%, you get
#3E4380. If the color is desaturated by 10%, the color
#424778 is obtained.