MACROMEDIA STUDIO 8-EXPLORING STUDIO 8 Manual page 323

2. In the Property inspector (Window > Properties), click the Align Center
button.
Dreamweaver inserts CSS <div> tags that center the body content of
the page. In Design view, a dotted line borders the area that the <div>
tags center.
3. Save the page.
Your page is now finished. The last task of building your website is to
publish the page. To publish the page, you must define a folder on a
remote site and upload your files to that folder. For instructions, continue
to the next tutorial.
(Optional) Center the contents of the page 323