Description of the bug
When adding the arrow prop, that arrow gets and id="arrow", which represents an issue for accessibility because every id in the page must be unique.

To Reproduce
Steps to reproduce the behavior:

1. Use more than one popper with the arrow prop set to true in the same page
2. Inspect and see all of them have a div with the id=arrow

Expected behavior
Every id in a page has to be unique, therefore the use of a class is more appropiate

Screenshots