<div class="wrapper">
  <span class="bounce_button">Hover Me</span>
 </div>

@keyframes bounce {
	0%, 100%, 20%, 50%, 80% {
		-webkit-transform: translateY(0);
		-ms-transform:     translateY(0);
		transform:         translateY(0)
	}
	40% {
		-webkit-transform: translateY(-30px);
		-ms-transform:     translateY(-30px);
		transform:         translateY(-30px)
	}
	60% {
		-webkit-transform: translateY(-15px);
		-ms-transform:     translateY(-15px);
		transform:         translateY(-15px)
	}
}
span {  
  position: absolute;
  top: 50%;
  left: 50%;
  height: 180px;
  width: 180px;
  background-color: red;  
  border-radius: 50%;
  line-height: 180px;
  text-align: center;
  text-transform: uppercase;
  -webkit-animation-duration: 1s;
  animation-duration: 1s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-animation-timing-function: ease-in-out;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  -webkit-animation-iteration-count: infinite;
  color: white;
}
span:hover {
  cursor: pointer;
  animation-name: bounce;
  -moz-animation-name: bounce;
}