The hex color #301d4c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#CFE2B3. The grayscale version is
#333333. A 20% lighter version of the original color is
#63507F, and Hex
#000019 is the 20% darker color. If the color is saturated by 10%, you get
#301B4F. If the color is desaturated by 10%, the color
#301F4A is obtained.