Reference the external style sheet.

Save the style sheet and close the CSS Editor. Select all the pages in your site that you want to use the styles contained in the external style sheet (Ctrl+click to select multiple files), and click the Create New Link to External CSS button in the CSS palette. Drag the pick whip from the CSS palette to the external style sheet in the Files tab of the site window.

In one step, you’ve applied a style sheet containing an HTML element style and a class style to multiple pages in your Web site. To update these pages with new styles, simply update the external style sheet and save your changes. If you decide you no longer want to reference the external style sheet from these pages, select the pages in the Files tab of the site window, select the external style sheet in the CSS palette, and click the Remove Selected Items button.