Environment Information

• Package version(s): (fill this out) whatever the demo website uses
• Browser and OS versions: Edge 87, Chrome 87, Windows 10 20H2

Please provide a reproduction of the bug in a codepen:

https://developer.microsoft.com/en-us/fluentui#/controls/web/choicegroup

Actual behavior:

Expected behavior:

(from XAML Controls Gallery)

Priorities and help requested:

Are you willing to submit a PR to fix? (No)

Requested priority: (Normal)

Products/sites affected: (if applicable)

USING HIDPI DISPLAY. You surely have a Surface, all of which are HiDPI.