The hex color #34637f is a dark color. The web-safe version is Hex
#336666. A complementary color is
#CB9C80. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#6796B2, and Hex
#01304C is the 20% darker color. If the color is saturated by 10%, you get
#306482. If the color is desaturated by 10%, the color
#38627C is obtained.