JSFiddle - React, Tailwind, and code Playground

by luka kupunia

HTML

<div class="box">
  <div class="box1"></div>
</div>

CSS

div.box  {
  width: 300px;
  height: 50px;
  overflow: hidden;
}
div.box1 {
  width: 500px;
  height: 50px;
  box-shadow: inset 0px 0px 30px 0px rgba(0,0,0,0.75);
  border-top-left-radius: 20px;
  border-bottom-left-radius: 20px;
}