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

Since there isn’t an actual border feature in Google Docs, you can add objects to your document and give it the appearance of having a border. Let’s look at the three ways in which you can do that.

Using Border Painter, you can apply a Border & Shading to a Table and change its Color in Microsoft Word documents. Follow the steps below to use the Border Painter in Word: Launch Microsoft Word.