Class styles are the only type of CSS style that can be applied to any text in a document, regardless of which tags control the text. All class styles associated with the current document are displayed in the CSS Styles panel (with a period [.] preceding their name) and in the Style pop‑up menu of the text Property inspector.
You’ll see most styles updated immediately, however, you should preview your page in a browser to verify a style was applied as expected. When you apply two or more styles to the same text, the styles may conflict and produce unexpected results.
When
previewing styles defined in an external CSS style sheet, be sure
to save the style sheet to ensure that your changes are reflected
when you preview the page in a browser.
Apply a CSS class style
Remove a class style from a selection
Rename a class style