The hex color #3f67a0 is a dark color. The web-safe version is Hex
#336699. A complementary color is
#C0985F. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#729AD3, and Hex
#0C346D is the 20% darker color. If the color is saturated by 10%, you get
#3A66A5. If the color is desaturated by 10%, the color
#44689B is obtained.