The hex color #181930 is a dark color. The web-safe version is Hex
#000033. A complementary color is
#E7E6CF. The grayscale version is
#202020. A 20% lighter version of the original color is
#4B4C63, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#171832. If the color is desaturated by 10%, the color
#191A2E is obtained.