Dropdown z-index issues

Hey!

I´ve got some trouble with my dropdown-calender.

The dropdown list is set to absolute and should overlap above the other content.
Unfortunately the dropdown list is not above the other content.
Even if I set the z-index to e.g.z-index:10… Any ides what I´m doing wrong?
Here is a video of the problem


Problem is on page Home, 3rd section
Here is my site Read-Only: LINK
(how to share your site Read-Only link)

transform 3d is the issue which is being applied on collection-item-calendar class

This article can help

https://stackoverflow.com/questions/5472802/css-z-index-lost-after-webkit-transform-translate3d

You´re right. I deleted the interaction of the class and now it works. Thanks for help!