The hex color #2f3a3f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D0C5C0. The grayscale version is
#383838. A 20% lighter version of the original color is
#626D72, and Hex
#00070C is the 20% darker color. If the color is saturated by 10%, you get
#2E3A40. If the color is desaturated by 10%, the color
#303A3E is obtained.