When using https://stackoverflow.com/oauth/dialog, the OAuth dialog renders correctly on my normal browser window. Opening it inside a modal however results in an empty window, because body has a min-width set which shifts the centered box outside of the dialog viewport.

Here's the problem:

And here's what it should look like, after I have manually removed the min-width and margin of the body:

Is there any way to solve this, is this expected behavior, or is this indeed a bug?