The hex color #0b213c is a dark color. The web-safe version is Hex
#003333. A complementary color is
#F4DEC3. The grayscale version is
#232323. A 20% lighter version of the original color is
#3E546F, and Hex
#000009 is the 20% darker color. If the color is saturated by 10%, you get
#09213F. If the color is desaturated by 10%, the color
#0D2139 is obtained.