The hex color #677A8F is a dark color. The web-safe version is Hex
#666699. A complementary color is
#988570. The grayscale version is
#7B7B7B. A 20% lighter version of the original color is
#9AADC2, and Hex
#34475C is the 20% darker color. If the color is saturated by 10%, you get
#657A91. If the color is desaturated by 10%, the color
#697A8D is obtained.