The hex color #3c797c is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C38683. The grayscale version is
#666666. A 20% lighter version of the original color is
#6FACAF, and Hex
#094649 is the 20% darker color. If the color is saturated by 10%, you get
#387B7E. If the color is desaturated by 10%, the color
#40777A is obtained.