.contenedor{
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

span{
  border-radius: 360px;
}

.contenedor-ojo{
  padding: 20px;
  background-color: #fff;
  overflow: hidden;
  position: relative;
}

.contenedor-ojo:first-of-type{
  margin-right: 60px; 
}

.pestanya{
  position: absolute;
  top: -100px;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #404040;
  z-index: 999;
  border-radius: 0;
  animation: pestanyeo 5s linear infinite;
}

@keyframes pestanyeo{
  0%{top: -100px;}
  2%{top: 0;}
  4%{top: -100px;}
  100%{top: -100px;}
}

.ojo{
  display: inline-block;
  width: 40px;
  height: 40px;
  background-color: white;
  position: relative;
  /*overflow: hidden;*/
}

.iris{
  display: inline-block;
  width: 30px;
  height: 30px;
  background-color: black;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.2s, height 0.2s;
}