To insert text in the background of a page, users should use a page color watermark page border style

Watermark

Explanation:

Almost all versions of Microsoft Word allow you to insert watermarks. Watermarks help users insert text and images that appear in the background of your Word document. These texts can sometimes appear as images or just plain text and are remarkable when used. The watermark option can be found under the design tab for newer versions of Word or the page layout tab in older versions