<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css">
<div class="social-buttons"><a href="#" class="social-button facebook"><i class="fa fa-facebook"></i></a><a href="#" class="social-button twitter"><i class="fa fa-twitter"></i></a><a href="#" class="social-button google"><i class="fa fa-google"></i></a><a href="#" class="social-button dribbble"><i class="fa fa-dribbble"></i></a>
</div>

body {
  background-color: #F4F4F4;
}

html {
  box-sizing: border-box;
}
.social-buttons {
  height: 50px;
  font-size: 10;
  text-align: center;
  position: absolute;
  right: 0;
  left: 0;
  top: 40%;
  bottom: 50%;
}

.social-button {
  display: inline-block;
  background-color: #fff;
  width: 50px;
  height: 50px;
  line-height: 50px;
  margin-left: 0 !important;
  margin-right: 15px !important;
  text-align: center;
  position: relative;
  overflow: hidden;
  opacity: .99;
  border-radius: 50%;
  box-shadow: 0 0 30px 0 rgba(0,0,0,0.06);
  -webkit-transition: all .35s cubic-bezier(0.31,-0.105,0.43,1.59);
  transition: all .35s cubic-bezier(0.31,-0.105,0.43,1.59);
}

.social-button:before {
  content: '';
  background-color: #000;
  width: 120%;
  height: 120%;
  position: absolute;
  top: 90%;
  left: -110%;
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
  -webkit-transition: all .35s cubic-bezier(0.31,-0.105,0.43,1.79);
  transition: all .35s cubic-bezier(0.31,-0.105,0.43,1.79);
}

.social-button .fa {
  font-size: 28px;
  vertical-align: middle;
  -webkit-transform: scale(0.75);
  -ms-transform: scale(0.75);
  transform: scale(0.75);
  -webkit-transition: all .35s cubic-bezier(0.31,-0.105,0.43,1.59);
  transition: all .35s cubic-bezier(0.31,-0.105,0.43,1.59);
}

.social-button.facebook:before {
  background-color: #3B5998;
}

.social-button.facebook .fa {
  color: #3B5998;
}

.social-button.twitter:before {
  background-color: #3CF;
}

.social-button.twitter .fa {
  color: #3CF;
}

.social-button.google:before {
  background-color: #DC4A38;
}

.social-button.google .fa {
  color: #DC4A38;
}

.social-button.dribbble:before {
  background-color: #F26798;
}

.social-button.dribbble .fa {
  color: #F26798;
}

.social-button.skype:before {
  background-color: #00AFF0;
}

.social-button.skype .fa {
  color: #00AFF0;
}

.social-button:hover:before {
  top: -10%;
  left: -10%;
}

.social-button:hover .fa {
  color: #fff;
  -webkit-transform: scale(1);
  -ms-transform: scale(1);
  transform: scale(1);
}

.social-button:focus {
  opacity: .85;
}

* {
  margin: 0;
  padding: 0;
  color: inherit;
  box-sizing: inherit;
}

:focus {
  outline: none;
}