Gettin Bootstrap 3 Datepicker widget above everything else

I'm trying to get the widget to be above anything else (a map in my situation). See exemple : http://zoziologie.raphaelnussbaumer.com/improved-biolovision-visualisation/ I've try this without succes: .bootstrap-datetimepicker-widget{ z-index: 99999 !important; } I'm using this datepicker: http://eonasdan.github.io/bootstrap-datetimepicker/ Any idea?