The hex color #212772 is a dark color. The web-safe version is Hex
#333366. A complementary color is
#DED88D. The grayscale version is
#3E3E3E. A 20% lighter version of the original color is
#545AA5, and Hex
#00003F is the 20% darker color. If the color is saturated by 10%, you get
#1E2577. If the color is desaturated by 10%, the color
#24296D is obtained.