Add a short CSS class to an HTML Web page to use animated and stationary GIF images as the page's background. Open an HTML document and find the document's head section.

How to Add a Background Image to an OpenOffice Document. Adding an image to OpenOffice documents is a good way to brand printed material with a company logo or watermark, allowing your company's ...

Alternatively you can just drag the image onto the Safari page and it will automatically add it. Read this for more tips on using Safari: How to use Safari on a Mac. Plus: Best web browser for Mac.