The hex color #3e3e70 is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C1C18F. The grayscale version is
#4F4F4F. A 20% lighter version of the original color is
#7171A3, and Hex
#0B0B3D is the 20% darker color. If the color is saturated by 10%, you get
#3C3C73. If the color is desaturated by 10%, the color
#40406D is obtained.