The hex color #2f3e5f is a dark color. The web-safe version is Hex
#333366. A complementary color is
#D0C1A0. The grayscale version is
#444444. A 20% lighter version of the original color is
#627192, and Hex
#000B2C is the 20% darker color. If the color is saturated by 10%, you get
#2D3D62. If the color is desaturated by 10%, the color
#313F5C is obtained.