The hex color #3d28ab is a dark color. The web-safe version is Hex
#333399. A complementary color is
#C2D754. The grayscale version is
#5B5B5B. A 20% lighter version of the original color is
#705BDE, and Hex
#0A0078 is the 20% darker color. If the color is saturated by 10%, you get
#3A23B3. If the color is desaturated by 10%, the color
#402DA3 is obtained.