The hex color #636d6c is a dark color. The web-safe version is Hex
#666666. A complementary color is
#9C9293. The grayscale version is
#696969. A 20% lighter version of the original color is
#96A09F, and Hex
#303A39 is the 20% darker color. If the color is saturated by 10%, you get
#626D6C. If the color is desaturated by 10%, the color
#646D6C is obtained.