The hex color #313ADA is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#CEC525. The grayscale version is
#6C6C6C. A 20% lighter version of the original color is
#646DFF, and Hex
#0007A7 is the 20% darker color. If the color is saturated by 10%, you get
#2B35E5. If the color is desaturated by 10%, the color
#373FCF is obtained.