JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
  background:blue;
  border-top:10px solid red;
  border-bottom:10px solid red;
  border-radius:20px 20px 0 0;
  height:100px;
    
    /*
  border-right:1px solid transparent;
    */
}