The hex color #204b5c is a dark color. The web-safe version is Hex
#333366. A complementary color is
#DFB4A3. The grayscale version is
#424242. A 20% lighter version of the original color is
#537E8F, and Hex
#001829 is the 20% darker color. If the color is saturated by 10%, you get
#1D4C5F. If the color is desaturated by 10%, the color
#234A59 is obtained.