I have this extremely basic jQuery UI Modal Dialog that I wrote for testing here. Unless I am missing something I cannot figure out why their is that grey strip across the middle of the page. I am trying to manipulate the modal background color and opacity as well as seen in the CSS markup.
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The problem is that the background defined by jQuery UI is not just a solid color: it’s an image (to support patterns like stripes in the overlay). When you customize a jQuery UI theme with themeroller, it generates that colored image for you. To fix your page, all you need to do is edit the inline CSS in your page on line 48 from:
to:
This will override the entire background specification, not just the color.
UPDATE:
Nick Craver provided a demo of the fix at http://jsfiddle.net/QVXah/