The hex color #2d3e4e is a dark color. The web-safe version is Hex
#333366. A complementary color is
#D2C1B1. The grayscale version is
#3E3E3E. A 20% lighter version of the original color is
#607181, and Hex
#000B1B is the 20% darker color. If the color is saturated by 10%, you get
#2B3E50. If the color is desaturated by 10%, the color
#2F3E4C is obtained.