This element is used to have an image appear as the background of a page, behind standard content. Areas with no content do not show the image.
(Click image to enlarge)
Place the cursor where you want the code to appear in the content field and select the element from the right-hand list. The Image Browser will appear.
Select the image you want as the background, then click Done. The code will be placed in the content field.
Grid background code appears like this: