The hex color #e70a3a is a dark color. The web-safe version is Hex
#FF0033. A complementary color is
#18F5C5. The grayscale version is
#646464. A 20% lighter version of the original color is
#FF3D6D, and Hex
#B40007 is the 20% darker color. If the color is saturated by 10%, you get
#F40136. If the color is desaturated by 10%, the color
#DA133E is obtained.