The hex color #405a4f is a dark color. The web-safe version is Hex
#336666. A complementary color is
#BFA5B0. The grayscale version is
#4E4E4E. A 20% lighter version of the original color is
#738D82, and Hex
#0D271C is the 20% darker color. If the color is saturated by 10%, you get
#3F5B4F. If the color is desaturated by 10%, the color
#41594F is obtained.