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Sometimes we need a clip art image that appears transparent in our PowerPoint presentation. For example, as the background of a paragraph that mixed with the original background image.
To do the following steps:

1. Click on the Insert ribbon tab and click the button on the Clip Art
2. Click the Go button in the panel and select Clip Art Clip Art, and put in the presentation
3. Make a right click on clip art and select Group -> Ungroup
4. On the question “Do you want to convert …?” click Yes
5. Do it again, right click on the clip art and select Group -> Ungroup
6. In the clip art is still selected, open the Format ribbon click on the Shape Fill button and select More Fill Colors
7. Select colors and transparency values that match your background and click the OK button
8. If there is any area of the square with the clip art images, simply click on the area of a square and pressing the delete key