The hex color #3d2e8f is a dark color. The web-safe version is Hex
#333399. A complementary color is
#C2D170. The grayscale version is
#535353. A 20% lighter version of the original color is
#7061C2, and Hex
#0A005C is the 20% darker color. If the color is saturated by 10%, you get
#3B2A95. If the color is desaturated by 10%, the color
#3F3289 is obtained.