The hex color #3d698f is a dark color. The web-safe version is Hex
#336699. A complementary color is
#C29670. The grayscale version is
#676767. A 20% lighter version of the original color is
#709CC2, and Hex
#0A365C is the 20% darker color. If the color is saturated by 10%, you get
#396993. If the color is desaturated by 10%, the color
#41698B is obtained.