The hex color #3902e3 is a dark color. The web-safe version is Hex
#3300CC. A complementary color is
#C6FD1C. The grayscale version is
#5F5F5F. A 20% lighter version of the original color is
#6C35FF, and Hex
#0600B0 is the 20% darker color. If the color is saturated by 10%, you get
#3500F0. If the color is desaturated by 10%, the color
#3D0BD6 is obtained.