The hex color #1a3a3a is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E5C5C5. The grayscale version is
#2F2F2F. A 20% lighter version of the original color is
#4D6D6D, and Hex
#000707 is the 20% darker color. If the color is saturated by 10%, you get
#183B3B. If the color is desaturated by 10%, the color
#1C3939 is obtained.