The hex color #3d30d3 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C2CF2C. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#7063FF, and Hex
#0A00A0 is the 20% darker color. If the color is saturated by 10%, you get
#382ADD. If the color is desaturated by 10%, the color
#4236C9 is obtained.