The hex color #1b1b2c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E4E4D3. The grayscale version is
#212121. A 20% lighter version of the original color is
#4E4E5F, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#1A1A2D. If the color is desaturated by 10%, the color
#1C1C2B is obtained.