The hex color #3d5e5d is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C2A1A2. The grayscale version is
#535353. A 20% lighter version of the original color is
#709190, and Hex
#0A2B2A is the 20% darker color. If the color is saturated by 10%, you get
#3B5F5E. If the color is desaturated by 10%, the color
#3F5D5C is obtained.