The hex color #3e7f7f is a dark color. The web-safe version is Hex
#336666. A complementary color is
#C18080. The grayscale version is
#696969. A 20% lighter version of the original color is
#71B2B2, and Hex
#0B4C4C is the 20% darker color. If the color is saturated by 10%, you get
#3A8181. If the color is desaturated by 10%, the color
#427D7D is obtained.