The hex color #657fb0 is a dark color. The web-safe version is Hex
#666699. A complementary color is
#9A804F. The grayscale version is
#878787. A 20% lighter version of the original color is
#98B2E3, and Hex
#324C7D is the 20% darker color. If the color is saturated by 10%, you get
#627EB4. If the color is desaturated by 10%, the color
#6880AC is obtained.