JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
      width: 100px;
  height: 70px;
  border-radius: 100px 100px 0 0;
  border-top: 5px solid red;
  border-left: 5px solid red;
  border-right: 50px solid red;
}