The hex color #2d3f4c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D2C0B3. The grayscale version is
#3D3D3D. A 20% lighter version of the original color is
#60727F, and Hex
#000C19 is the 20% darker color. If the color is saturated by 10%, you get
#2B3F4D. If the color is desaturated by 10%, the color
#2F3F4B is obtained.