The hex color #2d3e4f is a dark color. The web-safe version is Hex
#333366. A complementary color is
#D2C1B0. The grayscale version is
#3E3E3E. A 20% lighter version of the original color is
#607182, and Hex
#000B1C is the 20% darker color. If the color is saturated by 10%, you get
#2B3E51. If the color is desaturated by 10%, the color
#2F3E4D is obtained.