<div class="icon">
  <div class="arrow"></div>
</div>

body {
  background-color: #00b894;
  margin: 0;
  padding: 0;
}

.icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  width: 80px;
  height: 60px;
  cursor: pointer;
}

.arrow {
  position: absolute;
  top: 25px;
  width: 90%;
  height: 10px;
  background-color: #fff;
  box-shadow: 0 3px 5px rgba(0, 0, 0, .2);
  animation: arrow 700ms linear infinite;
}

.arrow::after, .arrow::before {
  content: '';
  position: absolute;
  width: 60%;
  height: 10px;
  right: -8px;
  background-color: #fff;
}

.arrow::after {
  top: -12px;
  transform: rotate(45deg);
}

.arrow::before {
  top: 12px;
  box-shadow: 0 3px 5px rgba(0, 0, 0, .2);
  transform: rotate(-45deg);
}

const $icon = document.querySelector('.icon');
const $arrow = document.querySelector('.arrow');

$icon.onclick = () => {
  $arrow.animate([
    {left: '0'},
    {left: '10px'},
    {left: '0'}
  ],{
    duration: 700,
    iterations: Infinity
  });
}