The hex color #3d74ab is a dark color. The web-safe version is Hex
#336699. A complementary color is
#C28B54. The grayscale version is
#747474. A 20% lighter version of the original color is
#70A7DE, and Hex
#0A4178 is the 20% darker color. If the color is saturated by 10%, you get
#3874B1. If the color is desaturated by 10%, the color
#4374A6 is obtained.