The hex color #2d28ea is a dark color. The web-safe version is Hex
#3333FF. A complementary color is
#D2D715. The grayscale version is
#6A6A6A. A 20% lighter version of the original color is
#605BFF, and Hex
#0000B7 is the 20% darker color. If the color is saturated by 10%, you get
#2721F7. If the color is desaturated by 10%, the color
#332FDD is obtained.