Remove hover effect from social media icons

See http://theqmart.com/

How do I remove the hover effect from the social media icons? I did a workaround to easily replace the social icons by :

Targeting: li.av-social-link-facebook a and making the font transparent and changing the background to my own icon centered with no-repeat

Then I targetting: li.av-social-link-facebook a:hover and changed the background to a slightly larger image of the same custom icon

But the background circle that still shows up when I hover over each social icon is still there. I’ve searched and searched and I can’t find what to target to stop that hover effect.

Please let me know how to do that.