The hex color #3b3d5d is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C4C2A2. The grayscale version is
#474747. A 20% lighter version of the original color is
#6E7090, and Hex
#080A2A is the 20% darker color. If the color is saturated by 10%, you get
#3A3C5F. If the color is desaturated by 10%, the color
#3C3E5B is obtained.