The hex color #374b7c is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C8B483. The grayscale version is
#555555. A 20% lighter version of the original color is
#6A7EAF, and Hex
#041849 is the 20% darker color. If the color is saturated by 10%, you get
#344A80. If the color is desaturated by 10%, the color
#3A4C78 is obtained.