The hex color #567b6c is a dark color. The web-safe version is Hex
#666666. A complementary color is
#A98493. The grayscale version is
#6A6A6A. A 20% lighter version of the original color is
#89AE9F, and Hex
#234839 is the 20% darker color. If the color is saturated by 10%, you get
#547D6C. If the color is desaturated by 10%, the color
#58796C is obtained.