Try setting the height and width of the icon div to 200px. Beyond that, my guess would be whitespace in the image itself.
I recommend taking a look at the HTML page in a good web browser with a decent web inspector that shows all the different boxes in the box model (e.g. a WebKit-based browser, or Firefox with Firebug). Alternatively, add "border: 1px solid red;" to see where the image's bounding box actually is.
Oh, and another thing. I just noticed that you're floating the image to the right. If your paragraph style uses a ragged right margin, the right margin will appear larger because if an entire word doesn't fit, it gets kicked to the next line. Specifying a style that allows hyphenation can fix this. For example: