Adding the modal overlay screen makes the dialog look more prominent because it dims out the page content.

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Sed vel diam id libero rutrum convallis. Donec aliquet leo vel magna. Phasellus rhoncus faucibus ante. Etiam bibendum, enim faucibus aliquet rhoncus, arcu felis ultricies neque, sit amet auctor elit eros a lectus.

This is identical to the default dialog except a semi-transparent overlay layer is added as an option to make this look more modal and dim out the page content behind it to bring the user's attention to the dialog.

The dialog window can be moved, resized and closed with the 'x' icon.