The hex color #000b64 is a dark color. The web-safe version is Hex
#000066. A complementary color is
#FFF49B. The grayscale version is
#252525. A 20% lighter version of the original color is
#333E97, and Hex
#000031 is the 20% darker color. If the color is saturated by 10%, you get
#00086A. If the color is desaturated by 10%, the color
#040E5E is obtained.