The theme’s primary text color is controlled by the html selector in the style.css file that came with the theme. You can find the html selector near the beginning of the style.css file and it looks something like the following:

html {
background: #FFF;
color: #000;
}

The color property within the html selector controls the overall text color of the theme, with the exception of links. The paragraph selector ( p ) also controls the formating of text and color may differ from the html selector; you may need to change the color property in the paragraph selector as well. Color values are set in RGB HEX values, for example, #000000 is equivalent to black, #FFFFFF is equivalent to white. Please note that the RGB HEX values contain a hash mark ( # ) and are six characters in length.

You can read more about using RGB HEX values to set color values in CSS at:

Web colors

http://en.wikipedia.org/wiki/Web_colors

HTML Color Code Chart

http://html-color-codes.info/