JSFiddle - React, Tailwind, and code Playground

by Apple Ilagan

HTML

<div></div>

CSS

div {
    margin:20px;
    height: 120px;
    width: 250px;
    background-color: #ededed; 
    border:#ccc solid 1px;
    position:relative;
}
div:after{
    content:'';
    width:100px;
    height:100px;
    background:#fff;
    position:absolute;
    -moz-transform:rotate(45deg);
    -webkit-transform:rotate(45deg);
    transform:rotate(45deg);
    top:20px;
    left:-50px;
    border-right:#ccc solid 1px;
    border-top:#ccc solid 1px;
}