JSFiddle - React, Tailwind, and code Playground

HTML

<br><br><div class="container-div">
  <div class="child-div">
This div appears to be nested.
  </div>
</div>

CSS

.container-div {
  padding: 10px 10px 0;
background-color:#c3c3c3;
width:200px;
}

.child-div {
  display: inline-block;
  width: 100px;
  height: 60px;
  position:relative;
    top:-20px;
  border: 1px solid #efefef;
  background-color: #f5f5f5;
}