JSFiddle - React, Tailwind, and code Playground

HTML

<div><br/><br/>
</div>

CSS

div {
      width: 200px;
      height: 400px;
      background-color: blue;
      /* clip-path: polygon(50% 0%, 100% 0, 84% 36%, 84% 65%, 100% 100%, 50% 100%, 0 100%, 0% 70%, 0% 35%, 0 0); */
      background-image: radial-gradient(25% 75% at 100% 50%, red 75%, transparent 75%);
}