The hex color #30599c is a dark color. The web-safe version is Hex
#336699. A complementary color is
#CFA663. The grayscale version is
#626262. A 20% lighter version of the original color is
#638CCF, and Hex
#002669 is the 20% darker color. If the color is saturated by 10%, you get
#2B58A2. If the color is desaturated by 10%, the color
#355A96 is obtained.