The hex color #181f7e is a dark color. The web-safe version is Hex
#003366. A complementary color is
#E7E081. The grayscale version is
#3C3C3C. A 20% lighter version of the original color is
#4B52B1, and Hex
#00004B is the 20% darker color. If the color is saturated by 10%, you get
#141C85. If the color is desaturated by 10%, the color
#1C2277 is obtained.