How to set background-color, for editor (user input text area)?

Somehow, CKEditor is defaulting to using my website's body background-color (dark green) for the background of the WYSIWYG user input text area. I want off white instead (so the user can see what they are inputting.)

How do I force the user input textarea background-color to be a specific color, for example #FCF1DC ?

I suspect there may be at least 2 ways to do this: one using a specific selector in the editor*.css files of the skin, and another in one of the JavaScript files (config.js?) I'd love to know both ways, in case I need them.

In the CSS files for CKEditor version 3.x, I think it used to be cke_contents, so it would be done like this:

.cke_contents{
    background-color:#FCF1DC;
}

If it is still the same in version 4.x, then I must have something overriding the cke_contents setting, because that is not working.

Thanks in advance for your help!

Dennis