The hex color #3b537c is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C4AC83. The grayscale version is
#595959. A 20% lighter version of the original color is
#6E86AF, and Hex
#082049 is the 20% darker color. If the color is saturated by 10%, you get
#385280. If the color is desaturated by 10%, the color
#3E5478 is obtained.