Description:

The calendar will be overlaped when zoom in the page to about 170%

How reproducible:

100% on FF and Chrome

Steps:

1. Prepare a low version OSD cluster
2. Open Upgrade cluster dialog and Select "Schedule a different time"
3. Click the date box to call out the calendar
4. Zoom in the dialog

Actual result:

The calendar will be covered and cannot select month anymore

Expect result:

There should be a scroll bar when zoom in, the user can use the calendar