Datepicker has weird placement indside modal with max-height and scrollable content

[qenibas]

I've made a modal with a max height and scroll. The datepicker is doing something weird, not staying in placement when scrolling inside the modal. It gets fixed if I remove "max-height" from my modal, but then the design breaks.

Is it possible to make the datepicker fixed to a specific className or something like that?

Watch the video of the weirdness here: https://www.dropbox.com/s/9rzmci4nxqpj3jo/weirdscroll.mov?dl=0

Thanks!