floating

<style>
  .float {
font-size:2em;
color: #000;
animation-name: floating;
animation-duration: 3s;
animation-iteration-count: infinite;
animation-timing-function: ease-in-out;
}
@keyframes floating {
0% { transform: translate(0, 0px); }
50% { transform: translate(0, 15px); }
100% { transform: translate(0, -0px); }
}
</style>

<div class="float">floating</div>