The hex color #2f3d3b is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D0C2C4. The grayscale version is
#383838. A 20% lighter version of the original color is
#62706E, and Hex
#000A08 is the 20% darker color. If the color is saturated by 10%, you get
#2E3E3B. If the color is desaturated by 10%, the color
#303C3B is obtained.