The hex color #2e3f4c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D1C0B3. The grayscale version is
#3E3E3E. A 20% lighter version of the original color is
#61727F, and Hex
#000C19 is the 20% darker color. If the color is saturated by 10%, you get
#2C3F4D. If the color is desaturated by 10%, the color
#303F4B is obtained.