The hex color #3a3d6f is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C5C290. The grayscale version is
#4D4D4D. A 20% lighter version of the original color is
#6D70A2, and Hex
#070A3C is the 20% darker color. If the color is saturated by 10%, you get
#383B72. If the color is desaturated by 10%, the color
#3C3F6C is obtained.