You can add a border in a Google Docs page using a workaround, since there's no built-in border tool for doing this automatically.

You can add a Border to an image in a Google Docs document. Creating and putting a broder is very easy if you follow this procedure.

Sometimes a visual element is the best way to make a point and it's simple to add a variety of them to a Google Doc file.

How an attractive cover page can be added? You can find pre-formatted template and write on them and Google Docs has a lot of templates to make the cover page a really attractive one.