The hex color #1a37db is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#E5C824. The grayscale version is
#646464. A 20% lighter version of the original color is
#4D6AFF, and Hex
#0004A8 is the 20% darker color. If the color is saturated by 10%, you get
#1333E7. If the color is desaturated by 10%, the color
#213CCF is obtained.