Description: As a Qase admin, when I set up a widget with a custom date range, the calendar/date selector appears underneath the modal and cannot be selected.
Reproduction steps:
  1. Select a project > Click 'Dashboard' menu
  2. Click 'Add Widget' > Test case count
  3. Select/add the widget 'Test run average time'
  4. For the Period, choose 'Custom Range'
  5. Click in the 'Start date' box
Expected outcome: Date selector appears above the modal and allows the user to select a custom start date
Actual outcome: Date selector appears below the modal. Attempting to click on it will close the modal and prevent the user from selecting a custom date range.