Steps to replicate the issue (include links if applicable):

• Set the browser to use a larger font size (e.g. "very large" in Chrome), or use the browser developer tools to change the font size on the html element to something larger than 100%.
• Go to a page which can be added to the watchlist

What happens?:

The star icon is shown as a repeating pattern.

What should have happened instead?:

There should only be one star shown, centred properly.

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

Screenshot: