The hex color #3de1c5 is a light color. The web-safe version is Hex
#33CCCC. A complementary color is
#C21E3A. The grayscale version is
#A1A1A1. A 20% lighter version of the original color is
#70FFF8, and Hex
#0AAE92 is the 20% darker color. If the color is saturated by 10%, you get
#33E7C9. If the color is desaturated by 10%, the color
#47DBC1 is obtained.