style.css

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: #222;
  font-family: Arial, Helvetica, sans-serif;
}

a,
a.active,
a.focus,
a.hover,
a.visited {
  color: inherit;
  text-decoration: none;
}

.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100vh;
  min-height: 300px;
}

.accordion {
  -webkit-box-shadow: 0px 0px 100px 5px rgba(0,0,0,0.5);
  -moz-box-shadow: 0px 0px 100px 5px rgba(0,0,0,0.5);
  box-shadow: 0px 0px 100px 5px rgba(0,0,0,0.5);
  background-color: #333;
  width: 910px;
  min-width: 910px;
  display: block;
  list-style-type: none;
  overflow: hidden;
  height: 200px;
  margin: 0 auto;
}

ul li.tab {
  display: inline-block;
  float: left;
  background-color: #444;
  border-right: 1px solid #333;
  width: 100px;
  height: 200px;
  position: relative;
  margin: 0;
  transition: all 0.5s ease-in-out 0.1s;
  overflow: hidden;
}

li.tab .social {
  float: left;
  height: 200px;
  line-height: 200px;
  text-align: center;
  vertical-align: middle;
  width: 100px;
  font-size: 40px;
  color: white;
}

.tab:hover {
  width: 610px;
}

.tab .content {
  background: #fff;
  width: 510px;
  height: 200px;
  margin-left: 100px;
  position: relative;
}

.tab .content .content-wrapper {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 200px;
  padding: 0 35px 0 35px;
  width: 510px;
}

.tab .content h2 {
  font-size: 25px;
  font-weight: 700;
  margin-bottom: 10px;
}

.tab .content p {
  font-size: 16px;
  line-height: 1.4rem;
}

.tab:hover .social a {
  color: #ffffff;
}

.facebook:hover .social {
  background: #3b5998;
}
.twitter:hover .social {
  background: #00aced;
}
.linkedin:hover .social {
  background: #007bb6;
}
.github:hover .social {
  background: #171516;
}