Option: content_css

This option enables you to specify a custom CSS file that extends the theme content CSS. This CSS file is the one used within the editor (the editable area). The default location of this CSS file is within the current theme. This option can also be a comma separated list of URLs.

Example of usage of the content_css option:

tinyMCE.init({
	...
	content_css : "/mycontent.css"
});