The hex color #2d3d5e is a dark color. The web-safe version is Hex
#333366. A complementary color is
#D2C2A1. The grayscale version is
#434343. A 20% lighter version of the original color is
#607091, and Hex
#000A2B is the 20% darker color. If the color is saturated by 10%, you get
#2B3C61. If the color is desaturated by 10%, the color
#2F3E5B is obtained.