The hex color #1f309c is a dark color. The web-safe version is Hex
#333399. A complementary color is
#E0CF63. The grayscale version is
#4E4E4E. A 20% lighter version of the original color is
#5263CF, and Hex
#000069 is the 20% darker color. If the color is saturated by 10%, you get
#1A2DA4. If the color is desaturated by 10%, the color
#243394 is obtained.