The hex color #676ddc is a dark color. The web-safe version is Hex
#6666CC. A complementary color is
#989223. The grayscale version is
#909090. A 20% lighter version of the original color is
#9AA0FF, and Hex
#343AA9 is the 20% darker color. If the color is saturated by 10%, you get
#636AE4. If the color is desaturated by 10%, the color
#6B71D4 is obtained.