improve(migration): work on popover styling
improve(migration): work on popover styling

Related to CAM-5844

TitanUser/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,xlinur/camunda-bpm-webapp,xlinur/camunda-bpm-webapp,xlinur/camunda-bpm-webapp