Issue two problems: aspect ratio, float-left has been created.

I am not sure if this is a support request, feature request or bug.

I am using emimage, which uses colorbox-load to load an iframe.
I have two related problems.

A. The aspect ratio of the colorbox is not maintained as the browser window is resized.
Suppose this is the url I pass to colorbox:
http://mysite.com/foo.jpg?iframe=true&width=300&height=600
When the user resizes the browser window, the image and colorbox-height scale, but the colorbox-width remains at 300. And so the aspect ratio of the colorbox-window does not generally match the aspect ratio of the image.

B. The image is not centered in the colorbox-window
The image floats left inside the colorbox-window.
Colorbox adds this css to cboxContent:

element.style {
  float:left;
  height:293px; // recalculated as user resizes browser window
  width:300px; // the original width, passed as attribute in url's query string
}

Ideally, I would like to have a way to address both problems:
A. maintain aspect ratio of colorbox window, as browser window is resized.
B. center the image within the colorbox window.

If (A) is not possible, then (B) will suffice.

Thanks very much for any help or advice!