The hex color #3f36a3 is a dark color. The web-safe version is Hex
#333399. A complementary color is
#C0C95C. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#7269D6, and Hex
#0C0370 is the 20% darker color. If the color is saturated by 10%, you get
#3C32AA. If the color is desaturated by 10%, the color
#423A9C is obtained.