While you're writing in the box, a Format tab will appear in the top taskbar, which you can use to customize the box's text (font, character size, etc.) independently of the regular document's text.

There are features on Google Docs that let you make your paper, resume or flyer stand out. The “text box” and “shape” functions allow users to break up their work with a unique element.

These drawings are automatically saved to Google Drive, so when you're ready to add it to your Google Doc, follow the same steps for creating a text box, but click From Drive instead of New from ...

On your desktop PC, launch your browser of choice and open Google Docs. Next, open the Google Docs document you’d like to add a summary to. To the left of the menu bar, click View.