The hex color #155dd9 is a dark color. The web-safe version is Hex
#0066CC. A complementary color is
#EAA226. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#4890FF, and Hex
#002AA6 is the 20% darker color. If the color is saturated by 10%, you get
#0C5BE4. If the color is desaturated by 10%, the color
#1E5FCE is obtained.