index.html

<div id="face" class="face">
  <div class="eye">
    <div class="parpado"></div>
    <span class="eye_ball"></span>
  </div>
  <div class="eye">
    <div class="parpado"></div>
    <span class="eye_ball"></span>
  </div>
</div>

<style>
  .face {
    display: flex;
    min-height: 100vh;
    justify-content: center;
    align-items: center;
  }

  .eye {
    border-radius: 50%;
    border: 1px solid black;
    height: 120px;
    width: 200px;
    display: inline-block;
    margin: 10px;
    position: relative;
    overflow: hidden;
  }

  .eye_ball {
    content: '';
    display: block;
    width: 20px;
    height: 20px;
    background-color: black;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 20px solid #3490da;
    z-index: -1;
  }

  .parpado {
    height: 20%;
    width: 100%;
    background-color: beige;
    z-index: 20;
    border-bottom: 2px solid burlywood;
  }
</style>

<script>
  var face = document.getElementById('face');
  var eyes = document.getElementsByClassName('eye');
  var eyeBalls = document.getElementsByClassName('eye_ball');
  var parpados = document.getElementsByClassName('parpado');

  function parpadear(eye) {
    eye.style.transition = "all ease 0.2s";
    eye.style.height = "100%";

    setTimeout(function(){
      eye.style.transition = "all ease 0.5s";
      eye.style.height = "20%";
    }, 500);
  }

  for (var i=0; i < 2; i++) {
    eyes[i].addEventListener('click', function(){
      parpadear(this.getElementsByClassName('parpado')[0]);
    })
  }

  face.addEventListener('mousemove', function(event){
    const x = event.clientX * 100 / this.offsetWidth + "%";
    const y = event.clientY * 100 / this.offsetHeight + "%";

    for (var i = 0; i < 2; i++) {
      eyeBalls[i].style.left = x;
      eyeBalls[i].style.top = y;
      eyeBalls[i].style.transform = `translate(-${x}, -${y})`;
    }
  });

  setInterval(function(){
    for (var i=0; i < 2; i++) {
      parpadear(parpados[i]);
    }
  }, 5000);
</script>