Steps to reproduce

Go here: https://vuematerial.io/components/tabs/home with Safari on OSX and click the tabs

Which browser?

Safari 11.0.2 (12604.4.7.1.4) OSX Sierra 10.12.6 (16G1036)

What is expected?

The tab indicator should slide gracefully back and forth when I click the tabs.

What is actually happening?

The indicator slides back and forth, but the width varies from 0 to much-too-wide

This seems to be an issue with transitioning the value for "right" on the tab indicator. The issue is not appearing in Chrome or Firefox, just Safari.