JSFiddle - React, Tailwind, and code Playground

by Naresh

HTML

<div class="left">
  <div class="rectangle">
  
  </div>
</div>

<div class="right">

</div>

CSS

.left {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 30%;
  border: 1px solid blue;
  z-index: 10;
}

.right {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 30%;
  right: 0;
  border: 1px solid red;
  z-index: 20;
  background-color: lightgray;
}

.rectangle {
  position: relative;
  width: 50px;
  height: 50px;
  background-color: black;
  right: 0;
  top: 50%;
  z-index: 100;
}