The hex color #2b29f3 is a dark color. The web-safe version is Hex
#3333FF. A complementary color is
#D4D60C. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#5E5CFF, and Hex
#0000C0 is the 20% darker color. If the color is saturated by 10%, you get
#2422FF. If the color is desaturated by 10%, the color
#3230E6 is obtained.