The hex color #2c3d5d is a dark color. The web-safe version is Hex
#333366. A complementary color is
#D3C2A2. The grayscale version is
#424242. A 20% lighter version of the original color is
#5F7090, and Hex
#000A2A is the 20% darker color. If the color is saturated by 10%, you get
#2A3D60. If the color is desaturated by 10%, the color
#2E3E5A is obtained.