Steps to reproduce the issue

1. create a com_content custom field type = calendar
2. create a com_content custom field type = subform and add previously created custom field
3. add an article, go to fields and add a new row for subform
4. click on calendar icon to select a date

Expected result

Expecting to see the Calendar popup to pick a date.

Actual result

Calendar is opened but not shown entirely. Hidden due to an overflow statement in css

System information (as much as possible)

Happens since subformn is introduced

Additional comments