On safari the radio buttons are different sizes, are there any free emulators with a code inspector?

Question

css

The client uses safari, other browsers have radio buttons of the same size.
I don't know how to dig into the inspector specifically for safari.
Found https://www.browserstack.com/ , but there is catastrophically little time in the free version to find the problem and play with styles, interrupts the session.

Or maybe there is a special css way that fixes the size of safari radio buttons?