html {
  font-size: 14px;
}

body {
  background-color: #ccc;
  padding: 10px;
  text-align: center;
}


/* Wrapper */

.icon-button {
  background-color: white;
  border-radius: 0.5rem;
  cursor: pointer;
  display: inline-block;
  font-size: 2.0rem;
  height: 2.2rem;
  line-height: 3rem;
  margin: 0 5px;
  position: relative;
  text-align: center;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  width: 2.2rem;
}


/* Circle */

.icon-button span {
  border-radius: 0;
  display: block;
  height: 0;
  left: 50%;
  margin: 0;
  position: absolute;
  top: 50%;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  -o-transition: all 0.3s;
  transition: all 0.3s;
  width: 0;
}

.icon-button:hover span {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 0.5rem;
  margin: -1.2rem;
}

.twitter span {
  background-color: #4099ff;
}

.facebook span {
  background-color: #3B5998;
}

.google-plus span {
  background-color: #db5a3c;
}


/* Icons */

.icon-button i {
  background: none;
  color: white;
  height: 1rem;
  left: 0;
  line-height: 2.2rem;
  position: absolute;
  top: 0;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  -o-transition: all 0.3s;
  transition: all 0.3s;
  width: 2.2rem;
  z-index: 10;
}

.icon-button .icon-twitter {
  color: #4099ff;
}

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

.icon-button .icon-google-plus {
  color: #db5a3c;
}

.icon-button:hover .icon-twitter,
.icon-button:hover .icon-facebook,
.icon-button:hover .icon-google-plus {
  color: white;
}