The hex color #3d3d6b is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C2C294. The grayscale version is
#4C4C4C. A 20% lighter version of the original color is
#70709E, and Hex
#0A0A38 is the 20% darker color. If the color is saturated by 10%, you get
#3B3B6E. If the color is desaturated by 10%, the color
#3F3F68 is obtained.