• HTML
• CSS

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">

<div class="wrapper">
  <ul>
    <li class="facebook">
      <i class="fa fa-facebook" aria-hidden="true"></i>
      <div class="slider">
        <p>facebook</p>
      </div>
    </li>
    
    <li class="twitter">
      <i class="fa fa-twitter" aria-hidden="true"></i>
      <div class="slider">
        <p>twitter</p>
      </div>
    </li>
    
    <li class="instagram">
      <i class="fa fa-instagram" aria-hidden="true"></i>
      <div class="slider">
        <p>instagram</p>
      </div>
    </li>
    
    <li class="google">
      <i class="fa fa-google" aria-hidden="true"></i>
      <div class="slider">
        <p>google</p>
      </div>
    </li>
    
    <li class="whatsapp">
      <i class="fa fa-whatsapp" aria-hidden="true"></i>
      <div class="slider">
        <p>whatsapp</p>
      </div>
    </li>
  </ul>
</div>

CSS

* {
  margin: 0;
  padding: 0;
}

body {
  background: #30333A;
}

.wrapper {
  position: absolute;
  top: 50%;
  left: 45%;
  transform: translate(-50%, -50%);
}

ul {
  list-style: none;
}

ul li {
  width: 50px;
  height: 50px;
  position: relative;
  background: #e59500;
  margin: 10px 0;
  cursor: pointer;
  border-radius: 3px;
  box-shadow: 0 0 10px rgba(0,0,0,0.3);
}

ul li .fa {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 20px;
  color: #fff;
}

ul li.facebook{
  background: #3b5998;
}

ul li.twitter{
  background: #00aced;
}

ul li.instagram{
  background: #bc2a8d;
}

ul li.google{
  background: #dd4b39;
}

ul li.whatsapp{
  background: #4dc247;
}

ul li.facebook div.slider{
  background: #627aac;
}

ul li.twitter div.slider{
  background: #7fd5f6;
}

ul li.instagram div.slider{
  background: #dd94c6;
}

ul li.google div.slider{
  background: #eea59c;
}

ul li.whatsapp div.slider{
  background: #82d47e;
}

.slider {
  content: "";
  position: absolute;
  top: 0;
  left: 51px;
  width: 0px;
  height: 50px;
  background: #eebb5c;
  border-radius: 3px;
  transition: all 0.5s 0.3s ease;
}

.slider p {
  font-family: arial;
  text-transform: uppercase;
  font-size: 16px;
  font-weight: 900;
  color: #fff;
  text-align: center;
  line-height: 50px;
  opacity: 0;
  transition: all 0.6s ease;
}

ul li:hover .slider {
  width: 180px;
  transition: all 0.5s ease;
}

ul li:hover .slider p {
  opacity: 1;
  transition: all 1s 0.2s ease;
}

/* All credits to: https://www.youtube.com/watch?v=KpAl3ME4wKs */