The hex color #1f28e3 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#E0D71C. The grayscale version is
#636363. A 20% lighter version of the original color is
#525BFF, and Hex
#0000B0 is the 20% darker color. If the color is saturated by 10%, you get
#1822F0. If the color is desaturated by 10%, the color
#262ED6 is obtained.