The hex color #3a28e5 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C5D71A. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#6D5BFF, and Hex
#0700B2 is the 20% darker color. If the color is saturated by 10%, you get
#3521F1. If the color is desaturated by 10%, the color
#3F2FD9 is obtained.