The hex color #40444f is a dark color. The web-safe version is Hex
#333366. A complementary color is
#BFBBB0. The grayscale version is
#464646. A 20% lighter version of the original color is
#737782, and Hex
#0D111C is the 20% darker color. If the color is saturated by 10%, you get
#3F4450. If the color is desaturated by 10%, the color
#41444E is obtained.