graphics with Grey background

Thanks for the help with the issue of increasing the size of the page in Lectora, Dr. Lectora. New adventure--I created a callout in powerpoint and saved it as a png. I copied it into Lectora. The graphic comes across great in preview mode. There are no shadows or or backgrounds, but when I publish in HTML I get a grey background around the graphic. Looks bad. I even tried copying the graphic from Adobe Photoshop. NO change. Any ideas? HD@inpo

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