I have copied your picture, resized it and placed it centered on another plain white picture with width=800.
Then I have cut it into pieces (top and bottom) and saved them as transparent gif.
The epub was made with Calibre. With Sigil I got a white space between top and bottom part and I didn't know how to get rid of it. With Calibre as well as with Sigil your picture is always centered with the text floating along. But when opening the Calibre.epub in Sigil you will get the white space again. I would recommend to download Calibre to get the epub-viewer. It can be used as stand-alone viewer.
George
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