The hex color #3d435d is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C2BCA2. The grayscale version is
#4A4A4A. A 20% lighter version of the original color is
#707690, and Hex
#0A102A is the 20% darker color. If the color is saturated by 10%, you get
#3C425F. If the color is desaturated by 10%, the color
#3E445B is obtained.