JSFiddle - React, Tailwind, and code Playground

HTML

<div class="social-icon-holder">
  <div class="social-icon">
    <div class="twitter">
      <div class="front">t</div>
      <div class="back">t</div>
    </div>
  </div>
</div>

CSS

.social-icon-holder {
  float: left;
  padding-left: 10px;
}

.social-icon {
  width: 40px;
  height: 40px;
  font-size: 30px;
  text-decoration: none;
  cursor: pointer;
  text-align: center;
  line-height: 40px;
  position: relative;
  -moz-transition: 0.5s;
  -o-transition: 0.5s;
  -webkit-transition: 0.5s;
  transition: 0.5s;
  /*  background: #000;*/
  color: #fff;
  float: left;
  -moz-border-radius: 100%;
  -webkit-border-radius: 100%;
  border-radius: 100%;
  border: 3px solid #fff;
}

.social-icon:hover {
  color: #fff;
  -moz-transform: rotateY(-180deg);
  -webkit-transform: rotateY(-180deg);
  transform: rotateY(-180deg);
}

.social-icon:hover .front {
  -moz-backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.social-icon:hover .back {
  -moz-backface-visibility: visible;
  -webkit-backface-visibility: visible;
  backface-visibility: visible;
}

.social-icon .front,
.social-icon .back {
  width: 40px;
  height: 40px;
  position: absolute;
  -moz-border-radius: 100%;
  -webkit-border-radius: 100%;
  border-radius: 100%;
  -moz-backface-visibility: visible;
  -webkit-backface-visibility: visible;
  backface-visibility: visible;
}

.social-icon .back {
  -moz-transform: rotateY(-180deg);
  -webkit-transform: rotateY(-180deg);
  transform: rotateY(-180deg);
  -moz-backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.social-icon .twitter .back {
  background: #00ACED;
}