Attached images aren't getting styled

In image_attach.css, there's a rule:

.image-attach-body {
  float: right;
  margin-left: 1em;
}

As far as I can tell, this isn't applied anywhere.
Meanwhile, attached images in a node's regular view appear above all the text (which doesn't look very good), and have the class 'image-attach'.

I suspect these images should be getting the class that's in the css file.
Here's a patch for that.