Css button effect – social icon

<div class="socialButton animated"> 
  <a href="#" class="facebook"><i class="fa fa-facebook"></i></a>  
        <a href="#" class="twitter"><i class="fa fa-twitter"></i></a>  
        <a href="#" class="google-plus"><i class="fa fa-google-plus"></i></a>  
        <a href="#" class="github"><i class="fa fa-github"></i></a>  
        <a href="#" class="email"><i class="fa fa-envelope"></i></a>  
</div>

@import url('https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css');
.socialButton {
  margin-top: 0px;
}
.socialButton > a {
  position: relative;
  font-size: 20px;
  text-align: center;
  display: inline-block;
  color: white;
  z-index: 1;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.3);
  border: 0 none;
  line-height: 45px;
  margin: 10px;
  width: 45px;
  height: 45px;
}
.socialButton > a::before {
  content: "";
  position: absolute;
  display: block;
  width: 100%;
  height: 100%; 
  border: 0 none;
  -webkit-transform: rotate(0deg);
  -moz-transform: rotate(0deg);
  -ms-transform: rotate(0deg);
  -o-transform: rotate(0deg);
  transform: rotate(0deg);
  -webkit-transition: 0.5s all ease-in-out;
  -moz-transition: 0.5s all ease-in-out;
  -o-transition: 0.5s all ease-in-out;
  transition: 0.5s all ease-in-out;
  z-index: -1;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden; 
}
.socialButton > a:hover::before {
  background: #02c39a;
  border-radius: 0;
  border: 0;
  -webkit-transform: rotate(225deg);
  -moz-transform: rotate(225deg);
  -ms-transform: rotate(225deg);
  -o-transform: rotate(225deg);
  transform: rotate(225deg);
}
.socialButton > a.facebook:hover::before {
  background: #3b5998;
}
.socialButton > a.twitter:hover::before {
  background: #1cadeb;
}
.socialButton > a.google-plus:hover::before {
  background: #d95232;
}
.socialButton > a.github:hover::before {
  background: #0d2636;
}
.socialButton > a.email:hover::before {
  background: #02c39a;
}