Tooltip renders outside of mobile view

In all of my implementations of vue-mention, the popup is positioned partially off screen on mobile. It appears like popper is calculating the left position outside of the boundaries of the viewport.

Quick example [browser](https://xkz9v.csb.app/) / [codesandbox](https://codesandbox.io/s/vue-mention-sandbox-forked-xkz9v)


However, when I look at the demo on [vue-mention.netlify.app](https://vue-mention.netlify.app/), the position appears to be calculated correctly.


I doesn't appear to be just margin on the input. If I remove the margin from the netlify demo, the popup still renders well within the view.

Thoughts on this?