The hex color #3eb8b0 is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#C1474F. The grayscale version is
#8D8D8D. A 20% lighter version of the original color is
#71EBE3, and Hex
#0B857D is the 20% darker color. If the color is saturated by 10%, you get
#36BCB4. If the color is desaturated by 10%, the color
#46B4AC is obtained.