JSFiddle - React, Tailwind, and code Playground

HTML

<div class="foo">&nbsp;</div>

CSS

body {background: #000;}
.foo {
    position: relative;
    display: block;
    width: 261px;
    height: 88px;
    background: url(http://i.stack.imgur.com/iig99.png) no-repeat 0 0;
}
.foo::after {
    content: '';
    position: absolute;
    display: block;
    width: 0;
    height: 0;
    top: 0;
    right: -47px;
    border-right: 47px solid transparent;
    border-bottom: 88px solid #fff;
}