The hex color #3E71A8 is a dark color. The web-safe version is Hex
#336699. A complementary color is
#C18E57. The grayscale version is
#727272. A 20% lighter version of the original color is
#71A4DB, and Hex
#0B3E75 is the 20% darker color. If the color is saturated by 10%, you get
#3971AD. If the color is desaturated by 10%, the color
#4371A3 is obtained.