You can adjust it in the slide master (View > Master > Slide Master) if it is
insert as a picture. If the picture has been inserted as a background which
you can't move it, you will have to save the background and re-insert (Insert
Picture > From file) it into the slide master so as to adjust it properly.
Is that what you want?
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http://www.pptheaven.xs3.com
PowerPoint Heaven - The Power to Animate
Contains tutorials on creating amazing animations for your PowerPoint
Presentations.
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