There are a handful of LBIM-specific classes that allow styling of the dialog content area (drupal-lbim-modal, lbim-dialog and lbim-dialog-iframe). Adding a class to the dialog container itself would make it easier to theme the entire dialog.
Add a class to the ui-dialog container — maybe somthing like ui-dialog--lbim.
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Seems like my change was somehow committed to the 1.0.x branch, rather than the issue fork? How is that possible?
It was committed to the "issue fork" of the original code repo.
In any case, I agree it would be helpful to have a class here. In my case, I want to change the opacity of the background overlay, but only when this specific dialog is used.