The hex color #3b3da3 is a dark color. The web-safe version is Hex
#333399. A complementary color is
#C4C25C. The grayscale version is
#5E5E5E. A 20% lighter version of the original color is
#6E70D6, and Hex
#080A70 is the 20% darker color. If the color is saturated by 10%, you get
#373AAA. If the color is desaturated by 10%, the color
#3F409C is obtained.