The hex color #21a58c is a dark color. The web-safe version is Hex
#339999. A complementary color is
#DE5A73. The grayscale version is
#717171. A 20% lighter version of the original color is
#54D8BF, and Hex
#007259 is the 20% darker color. If the color is saturated by 10%, you get
#19AA8F. If the color is desaturated by 10%, the color
#29A089 is obtained.