@import url(https://fonts.googleapis.com/css?family=Roboto+Condensed:400,300);

body {
  display: table;
  width: 100%;
  height: 100vh;
  margin: 0;
  background: #333;
  font-family: 'Roboto Condensed', sans-serif;
  font-size: 20px;
  font-weight: 300;
  letter-spacing: 5px;
  text-transform: uppercase;
  color: #fff;
}

.container {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  width: 600px;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

li {
  display: inline-block;
  padding: 0 20px;
}

span {
  position: relative;
  display: block;
  cursor: pointer;
}

span:before, span:after {
  content: '';
  position: absolute;
  width: 0%;
  height: 1px;
  top: 50%;
  margin-top: -0.5px;
  background: #fff;
}

span:before {
  left: -2.5px;
}
span:after {
  right: 2.5px;
  background: #fff;
  transition: width 0.8s cubic-bezier(0.22, 0.61, 0.36, 1);
}

span:hover:before {
  background: #fff;
  width: 100%;
  transition: width 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
}

span:hover:after {
  background: transparent;
  width: 100%;
  transition: 0s;
}