Add a fill or effect to a shape or text box - Microsoft Support
You can change the look of a shape or text box by changing its fill or by adding effects to it, such as shadows, glows, reflections, soft edges, bevels, and three-dimensional (3-D) rotations. A fill is a color, pattern, texture, picture, or gradient applied to the interior of a shape.
Add, copy, or remove a text box in Word - Microsoft Support
Text boxes can be useful for drawing attention to specific text and can also be helpful when you need to move text around in your document. Go to Insert > Text Box, and then select one of the pre-formatted text boxes from the list, select More Text Boxes from Office.com, or …
Improve accessibility with the Accessibility Checker
In the Accessibility pane, review and address the findings under Inspection Results. In the Accessibility pane, you'll see a list of errors and warnings, with how-to-fix recommendations for each. To quickly correct the issues, apply one of the recommended actions.