The hex color #3D2B5E is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C2D4A1. The grayscale version is
#424242. A 20% lighter version of the original color is
#705E91, and Hex
#0A002B is the 20% darker color. If the color is saturated by 10%, you get
#3D2961. If the color is desaturated by 10%, the color
#3E2D5B is obtained.