Help:Greybox
Here is how to create a grey box around a particular selection of text: Place two {{ at the start of the box, followed (with no space) by the word greybox followed (with no space) by a | followed (with no space) by the word text, followed (with no space) by = (an equals sign), followed (with no space) by the start of the text. At the very end of the text that you wish to be included in the box place two }}. Here is an example: {{greybox|text=As an experiment in history by the the people, some of the content of OutHistory.org is user-generated by anyone with data or documents and source citations to share. Content is also solicited from or volunteered by independent scholars, institutionally-based researchers, archivists, collectors, and the public. Users are encouraged to participate in creating the site, following the site’s [[About#Contributors.27_Guidelines|Contributors’ Guidelines]]. So help OutHistory.org make history.}}