The hex color #2f3d4c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D0C2B3. The grayscale version is
#3D3D3D. A 20% lighter version of the original color is
#62707F, and Hex
#000A19 is the 20% darker color. If the color is saturated by 10%, you get
#2E3D4D. If the color is desaturated by 10%, the color
#303D4B is obtained.