The hex color #155ce3 is a dark color. The web-safe version is Hex
#0066CC. A complementary color is
#EAA31C. The grayscale version is
#717171. A 20% lighter version of the original color is
#488FFF, and Hex
#0029B0 is the 20% darker color. If the color is saturated by 10%, you get
#0C5AEE. If the color is desaturated by 10%, the color
#1E5ED8 is obtained.