You can insert a PDF into a PowerPoint either as an object, and then set it so it opens when you click it.
You can change the background of your PowerPoint slides using the "Format Background" feature located in the "Design" tab.
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How to Crop Pictures in Microsoft Word, Excel, and PowerPoint
To manually crop a picture in Microsoft Word, Excel, or PowerPoint, select it, and in the Picture Format tab on the ribbon, click the top half of the split "Crop" button.
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