The hex color #3d67b0 is a dark color. The web-safe version is Hex
#336699. A complementary color is
#C2984F. The grayscale version is
#717171. A 20% lighter version of the original color is
#709AE3, and Hex
#0A347D is the 20% darker color. If the color is saturated by 10%, you get
#3866B6. If the color is desaturated by 10%, the color
#4268AA is obtained.