The hex color #664e2c is a dark color. The web-safe version is Hex
#666633. A complementary color is
#99B1D3. The grayscale version is
#4B4B4B. A 20% lighter version of the original color is
#99815F, and Hex
#331B00 is the 20% darker color. If the color is saturated by 10%, you get
#694E29. If the color is desaturated by 10%, the color
#634E2F is obtained.