The hex color #2d28dd is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#D2D722. The grayscale version is
#666666. A 20% lighter version of the original color is
#605BFF, and Hex
#0000AA is the 20% darker color. If the color is saturated by 10%, you get
#2722E9. If the color is desaturated by 10%, the color
#332ED1 is obtained.