XenForo Can't disable background change on hover (Font Awesome icon)

[JackieChun]

When you hover over a hyperlinked Font Awecome icon, the icon's background changes slightly. As an example, see the RSS icon in XenForo's footer. I am unable to disable this through any method in CSS short of a universal disable.
Code:

* { background: none !important;}

Inspecting the elements in Chrome/Firefox developer tools did not produce any results. I have disabled every available background quality, and this change still persists. Can anyone explain why this can't be disabled...

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