The hex color #3b5d9c is a dark color. The web-safe version is Hex
#336699. A complementary color is
#C4A263. The grayscale version is
#676767. A 20% lighter version of the original color is
#6E90CF, and Hex
#082A69 is the 20% darker color. If the color is saturated by 10%, you get
#375CA1. If the color is desaturated by 10%, the color
#3F5E97 is obtained.