The hex color #3a937c is a dark color. The web-safe version is Hex
#339966. A complementary color is
#C56C83. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#6DC6AF, and Hex
#076049 is the 20% darker color. If the color is saturated by 10%, you get
#35977D. If the color is desaturated by 10%, the color
#3F8F7B is obtained.