The hex color #3d6da4 is a dark color. The web-safe version is Hex
#336699. A complementary color is
#C2925B. The grayscale version is
#6F6F6F. A 20% lighter version of the original color is
#70A0D7, and Hex
#0A3A71 is the 20% darker color. If the color is saturated by 10%, you get
#386DA9. If the color is desaturated by 10%, the color
#426D9F is obtained.