The hex color #2d3f6d is a dark color. The web-safe version is Hex
#333366. A complementary color is
#D2C092. The grayscale version is
#484848. A 20% lighter version of the original color is
#6072A0, and Hex
#000C3A is the 20% darker color. If the color is saturated by 10%, you get
#2A3E71. If the color is desaturated by 10%, the color
#304069 is obtained.