The hex color #0f21c6 is a dark color. The web-safe version is Hex
#0033CC. A complementary color is
#F0DE39. The grayscale version is
#525252. A 20% lighter version of the original color is
#4254F9, and Hex
#000093 is the 20% darker color. If the color is saturated by 10%, you get
#081CD2. If the color is desaturated by 10%, the color
#1626BA is obtained.