Position dialogs over other content (#2966)
Position dialogs over other content (#2966)

Fixes #2965
jelliotartz/Panoptes-Front-End,amyrebecca/Panoptes-Front-End,parrish/Panoptes-Front-End,amyrebecca/Panoptes-Front-End,alexbfree/Panoptes-Front-End,fmnhExhibits/Panoptes-Front-End,fmnhExhibits/Panoptes-Front-End,parrish/Panoptes-Front-End,amyrebecca/Panoptes-Front-End,jelliotartz/Panoptes-Front-End,alexbfree/Panoptes-Front-End,parrish/Panoptes-Front-End,zooniverse/Panoptes-Front-End,jelliotartz/Panoptes-Front-End,fmnhExhibits/Panoptes-Front-End,alexbfree/Panoptes-Front-End