The hex color #3d7aa3 is a dark color. The web-safe version is Hex
#336699. A complementary color is
#C2855C. The grayscale version is
#737373. A 20% lighter version of the original color is
#70ADD6, and Hex
#0A4770 is the 20% darker color. If the color is saturated by 10%, you get
#387BA8. If the color is desaturated by 10%, the color
#42799E is obtained.