JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
    display: inline-block;
    height: 110px;
    width: 500px;
    background: tomato;
    margin-left: 150px;
}
div:after{
    content: '';
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 40px 100px 40px 0;
    border-color: transparent tomato transparent transparent;
    position: absolute;
    left: 60px;
    top: 20px;
}