The hex color #3de7d0 is a light color. The web-safe version is Hex
#33FFCC. A complementary color is
#C2182F. The grayscale version is
#A7A7A7. A 20% lighter version of the original color is
#70FFFF, and Hex
#0AB49D is the 20% darker color. If the color is saturated by 10%, you get
#32EDD4. If the color is desaturated by 10%, the color
#48E1CC is obtained.