You don't need to use a separate style sheet, you can put the style inline with the HTML. If you switch to source view for the rich content editor and paste in something like this it should work:
<p style="text-indent: 10em;">
Lorem ipsum dolor sit amet, consectetur adipiscing elit. In et malesuada erat. Suspendisse potenti. Quisque dignissim ligula a nibh lacinia, ut viverra sem dictum. Aenean sollicitudin sit amet ligula nec pellentesque. Integer placerat laoreet augue, at suscipit massa suscipit eu. Nam posuere fermentum ligula. Suspendisse eu fermentum nisi, eu imperdiet arcu. Vivamus nulla turpis, tempus at dui quis, varius tincidunt nisl. Sed tempus imperdiet urna non fringilla. Proin rhoncus enim ac neque sodales, non venenatis ante facilisis. Nulla sed eros eget massa euismod tempor ut a dui. Phasellus eleifend varius turpis ut sagittis. Praesent consequat varius enim quis consectetur. In convallis est nibh, ac viverra ante tempus eu. In nec odio maximus arcu finibus tempor sit amet vel ex.
</p>
Having your indent use 'em' rather than 'px' means that it adjust depending on font size being used. You shouldn't need any ability to edit the themes
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.