The hex color #3e30a9 is a dark color. The web-safe version is Hex
#333399. A complementary color is
#C1CF56. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#7163DC, and Hex
#0B0076 is the 20% darker color. If the color is saturated by 10%, you get
#3B2CB1. If the color is desaturated by 10%, the color
#4135A1 is obtained.