Ninja form date picker doesn't work in popup

[Yop-La]

Describe the bug

I have a ninja form wirh a date picker filed in a popup . The date picker is ko when the form is in the popup. And the date picker is ok when on a simple page ( not in a popup ). By ko, I mean : " we can't select a date". The filed is frozen.

I have reproduced this bug on two wordpress site

Site information

Popup Maker version: Version 1.14.0 Ninja form version: Version 3.4.33

WordPress version: 5.6

PHP version: 7.3

Expected behavior

We should select date with date picker filed in the popup

Current behavior

We can't select date with date picker filed in the popup

Steps to reproduce

1.install last ninja form 2.install last popup maker 3.create a simple form with a date picker field 4. create a popup showing the previous form 5. trigger the popup 6. try to select a date

Errors

no error

Additional context

[Yop-La]

I found a fix. Datepicker is hidden by the popup overlay.

Here a quick fix:

.pum-overlay { z-index: 100 !important; }

[danieliser]

I think we can add some CSS to force the z-index of those fixed position dropdowns to always be above our popups as a more permanent solution.