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

Some people may find pop-ups annoying, but a well-designed pop-up can help computer users view lots of information in a small amount of space. PowerPoint slides, for example, often contain several ...

You can add a border to a PowerPoint slide by adding a rectangle shape and removing the fill color, which will give the appearance of a border.