JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
    margin:20px;
    width:500px;
    height:60px;
    border-bottom-left-radius: 90px 200px;
    border-bottom-right-radius: 90px 200px;
    //box-shadow: 0 5px 3px -5px #888,
    5px 0 3px -5px #888,
    -5px 0 3px -5px #888;    
}