JSFiddle - React, Tailwind, and code Playground

HTML

<div class="mainShape">
  <div class="subShape">

  </div>
</div>

CSS

.mainShape {
  position: relative;
  box-shadow: 6px 0 21px -3px rgba(86,93,111,0.12);
  background: white;
  width: 200px;
  height: 600px;
}

.subShape {
  position: absolute;
  top: 0px;
  right: -60px;
  width: 60px;
  height: 180px;
  box-shadow: 6px 0 21px -3px rgba(86,93,111,0.12);
}