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.

How to Put Borders Around Pictures on Google Docs. Google does not offer a feature that directly supports adding borders around the images inserted into a Google Docs document, as of May 2013.

Google today updated Google Docs with some basic image-editing tools. You can now crop, rotate, and add borders to images in a document without leaving Google Docs.

To hide 0r remove borders in Google Sheets and Docs, open the document, select the preferred table, then choose the relevant options to delete the borders.

How to Make Table Borders Invisible in Google Docs. Formatting Google Docs files to display data in organized rows and columns is an effective way to highlight and convey important ideas, and the ...