Although there isn't a direct feature to create borders on Google Docs, there are 3 workarounds that you can use to create that appearance.

Want to add some style and personality to your Google Docs files? Here’s a guide on how to add doodles, sketches, and other exciting media to your docs.

Here’s how it works. How to insert a text box in Google Docs Within Google Docs there is a pop-up version of Google Draw that allows you to insert shapes, text boxes and drawings into your document.