Add option for position:absolute owing to iOS 'bug'

Hi john_b, you can try to use 'Dialog' style for popup instead of 'Modal' type. But I think there will be still position: fixed. Also if popup window is wider than phone screen it resizes the page.

But I agree jQuery UI dialog is not responsive in iOS Safari. EBT Webform Popup uses default Drupal dialogs:
https://www.drupal.org/docs/develop/drupal-apis/ajax-api/ajax-dialog-boxes →

And this implementation uses jQuery UI Dialog, which is not supported anymore:
https://blog.jqueryui.com/2021/10/jquery-maintainers-update-and-transiti...
https://github.com/jquery/jquery-ui/issues/2246#issuecomment-2087497491

I can't use

.ui-dialog {position:absolute !important;}

in EBT Webform Popup, because it can break "Dialog" style for popup on other sites.

If you think that jQuery UI Dialog is working not right, you should raise a issue for Drupal Core, because it's a part of core functionality.