<div class="circle"/>
<div class="circle"/>
<div class="circle"/>

.circle{
  height:40px;
  width:40px;
  background-color:#142F43;
  border-radius:50px;
  margin-left:4em;
}

var element = document.getElementsByClassName('circle')

element.velocity(
  {
    marginTop:200,
  },
  {
    duration:1500,
    loop:true,
    easing:'swing'
  }
)