The hex color #15b21c is a dark color. The web-safe version is Hex
#009933. A complementary color is
#EA4DE3. The grayscale version is
#4C4C4C. A 20% lighter version of the original color is
#48E54F, and Hex
#007F00 is the 20% darker color. If the color is saturated by 10%, you get
#10BC17. If the color is desaturated by 10%, the color
#1AA821 is obtained.