The hex color #2d28d4 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#D2D72B. The grayscale version is
#636363. A 20% lighter version of the original color is
#605BFF, and Hex
#0000A1 is the 20% darker color. If the color is saturated by 10%, you get
#2822DF. If the color is desaturated by 10%, the color
#322EC9 is obtained.