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I presume that you wish to have the background cover everything from left to right on your form, but would like to ask if you also want the text to be right above the photo - so that the section that holds the fields is transparent and showing the background, or do you wish to have the segment with fields colored so that text can be easy to read and background as an image?
Once you let us know this, the image that you wish to use and the form, we would be happy to assist with the same.