The hex color #3d434b is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C2BCB4. The grayscale version is
#444444. A 20% lighter version of the original color is
#70767E, and Hex
#0A1018 is the 20% darker color. If the color is saturated by 10%, you get
#3C434C. If the color is desaturated by 10%, the color
#3E434A is obtained.