[Help] Make all .windowbg same color

[nil]

I'd like to make all text that is on the .windowbg to be one color and all of the text on windowbg2 to be the same different color.  For example all of the text (everywhere on the site) in .windowbg to be white and all the .windowbg2 on the site to be black.

Is it possible to do that, and how?

[ivogomes]

.windowbg {
   color: #000000;
}

.windowbg2 {
   color: #ffffff;
}