Does not detect when element overflows off the page

[jameskraus]

Fails to detect when an element goes right off the page:

This is a minor issue for me, but it occurred when the item was the first element on the page.

May be more of a bug with react-date-picker, but eh, this is probably where to address it.

Repro repo:
https://github.com/jameskraus/react-date-picker-overflow

[jameskraus]

Moving this issue to react-date-picker