The hex color #3d2b5d is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C2D4A2. The grayscale version is
#424242. A 20% lighter version of the original color is
#705E90, and Hex
#0A002A is the 20% darker color. If the color is saturated by 10%, you get
#3D2960. If the color is desaturated by 10%, the color
#3D2D5A is obtained.