Whenever you place an image (or text) inside a div without wrapping it in a P tag, the browser will add an implicit P tag around the image, and treat it to the default line-height and padding for a P on your page. I am pretty sure that's what's going on here, and you should be able to get rid of it by adding a style like this to the page:
#puzzle {
font-size: 0.1px;
line-height: 1;
}
Walter
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