JSFiddle - React, Tailwind, and code Playground

HTML

<div id="alone-boxes-wrapper">
  <div class="alone-box"></div> <!-- z-index: 1 -->
</div>


<div class="absolute-wrapper">

  <div class="wrapper animated">
    <div class="box-1">1111111111</div> <!-- z-index: 0 -->
    <div class="box-2">222222222</div> <!-- z-index: 2 -->
  </div>

</div>
























<script type="text/javascript">
	function toggle_class() {
  	if(document.getElementById('alone-boxes-wrapper').className == 'animated') {
    	document.getElementById('alone-boxes-wrapper').classList.remove('animated');
    } else {
    	document.getElementById('alone-boxes-wrapper').classList.add('animated');
    }
  }
</script>

<button type="button" style="position:absolute;top:120px" onClick="toggle_class()">alone-box toggle animation</button>

CSS

div.alone-box {
  position:absolute;
  z-index: 1;
  height: 100px;
  width:100px;
  background-color: #F4F1DE;
  opacity:0.9;
  border:1px dashed #000;
}

div.absolute-wrapper {
  position:absolute;
  top:20px;
}


div.wrapper {
  position:relative;
  height: 100px;
  width:100px;
  left: 50px;
}

div.wrapper .box-1 {
  position:absolute;
  z-index:0;
}

div.wrapper .box-2 {
  position:absolute;
  top: 20px;
  z-index:2;
}


@keyframes animation {
    from { transform: translateX(1rem); }
    to { transform: translateX(-1rem); }
}


div.wrapper.animated .box-1 {
  animation-name: animation;
  animation-duration: 5s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-timing-function: linear;
}

#alone-boxes-wrapper.animated {
  animation-name: animation;
  animation-duration: 5s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-timing-function: linear;
}