The hex color #3a6c6f is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C59390. The grayscale version is
#5C5C5C. A 20% lighter version of the original color is
#6D9FA2, and Hex
#07393C is the 20% darker color. If the color is saturated by 10%, you get
#376E71. If the color is desaturated by 10%, the color
#3D6A6D is obtained.