 eventEl ,null).getPropertyValue('background-color'),
          textColor: window.getComputedStyle( eventEl ,null).getPropertyValue('color'),
        };
      }
    });

    var calendar = new Calendar(calendarEl, {
      headerToolbar: {
        left  : 'prev,next today',
        center: 'title',
        right : 'dayGridMonth,timeGridWeek,timeGridDay'
      },
      themeSystem: 'bootstrap',
      //Random default events
      events: [
        {
          title          : 'All Day Event',
          start 