To ensure your background fits perfectly without stretching: Go to the tab. Select Slide Size > Custom Slide Size .
Place a very long image or text box that extends far below the slide frame. Use the Morph Transition on subsequent slides, moving the long object upward on each new slide to simulate a continuous scroll. 1024x768 scroll background for powerpoint">
where the background moves slower than the text. To ensure your background fits perfectly without stretching: