The hex color #0721A8 is a dark color. The web-safe version is Hex
#003399. A complementary color is
#F8DE57. The grayscale version is
#454545. A 20% lighter version of the original color is
#3A54DB, and Hex
#000075 is the 20% darker color. If the color is saturated by 10%, you get
#011DB2. If the color is desaturated by 10%, the color
#0D259E is obtained.