color

The color property in CSS is specifically for controlling the color of text.

p {
  color: green;
}

I’m an example of the above CSS taking effect on a specific paragraph.

You can use any color value, for instance:
#f00
#ff0000
rgb(100,100,100)
rgba(100,100,100,0.5)
hsl(20, 100%, 50%)
hsla(20, 100%, 50%, 0.5)
named colors

The color property does cascade. So for instance if you set it on the body, all decedent elements that don’t have their own color set in the user agent stylesheet will inherit that color.

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