You can change the background of your PowerPoint slides using the "Format Background" feature located in the "Design" tab.

Microsoft's PowerPoint presentation program offers you a variety of tools to create exciting presentations and slide shows. You may choose from a collection of features that allow you to add and edit ...

You can change the background to anything you like if you're using Powerpoint to create presentations: a picture, a color, a gradient, or even an in-motion video. You'll know the best background for ...