The hex color #21448e is a dark color. The web-safe version is Hex
#333399. A complementary color is
#DEBB71. The grayscale version is
#515151. A 20% lighter version of the original color is
#5477C1, and Hex
#00115B is the 20% darker color. If the color is saturated by 10%, you get
#1C4394. If the color is desaturated by 10%, the color
#264588 is obtained.