JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

body {
    background: #ececec;        
}
div {
    width: 0;
    height: 0;
    border-top: 50px solid #ececec;
    border-right: 100px solid #f7f7f7;
    border-bottom: 50px solid #ececec;
}