The hex color #0d303c is a dark color. The web-safe version is Hex
#003333. A complementary color is
#F2CFC3. The grayscale version is
#282828. A 20% lighter version of the original color is
#40636F, and Hex
#000009 is the 20% darker color. If the color is saturated by 10%, you get
#0A313E. If the color is desaturated by 10%, the color
#102F3A is obtained.