SOURCE

<div class="container">
  <div class="content-holder">
    <span><p> Hello </p></span>
    <span>
			<ul class="word-slider">
				<li>World!</li>
				<li>There!</li>
				<li>Kath!</li>
			</ul>
		</span>
  </div>
</div>

@import url(http://fonts.googleapis.com/css?family=Titillium+Web:700);

/*
	MAXIMUM WORD CAN BE SLIDE IS ONLY 3
*/

body {
  background: #1c1c1c;
  font: 700 40px 'Titillium Web', sans-serif;
  color: #fff;
}

.container {
  width: 340px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 25%;
  text-align: center;
  padding-left: 25px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  border-top: 1px solid rgba(255, 255, 255, 0.5);
}

.content-holder:before {
  content: '<';
  float: left;
  margin-top: -10px;
  margin-right: 10px;
  color: rgb(142, 101, 4);
}

.content-holder:after {
  content: '/>';
  float: left;
  margin-top: -10px;
  margin-left: 10px;
  color: rgb(142, 101, 4);
}

p,
ul {
  line-height: 42px;
  margin-top: 0px;
}

span {
  display: inline;
  float: left;
}

ul.word-slider {
  list-style: none;
  margin-left: -30px;
}

.content-holder {
  height: 50px;
  overflow: hidden;
}

ul li {
  padding: 5px;
}

ul.word-slider {
  animation: change 5s 1 alternate;
}

@keyframes change {
  0% {
    margin-top: -5px;
  }
  25% {
    margin-top: -57px;
  }
  50% {
    margin-top: -107px;
  }
  100% {
    margin-top: -5px;
  }
}