.push animation, hover.css

Hello,

on my website, I’ve set up an push animation on my buttons (www.cedricgournay.com). I’ve used hover.css / push (http://ianlunn.github.io/Hover/)

I have a small pb :
it works perfectly on Firefox, Chrome and Safari for PC. But on IE11, my buttons went totally left. So I’ve tried to change display:inline-block in .push and put inline only. It fixes the pb on IE but the animation does’nt work any more on Firefox and Safari.
I’ve contacted the authors but no answer, anyone can help me?
Thanks in advance !
Nice day / evening