JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outerBox">
  <div class="relativeBox">
  
  </div>
</div>

CSS

.outerBox{
  background: green;
  height: 300px;
  width: 300px;
}

.relativeBox{
   background: yellow;
   height: 30px;
   width: 30px;
   position: relative;
   top: 120px;
   left: 100px;
}