JSFiddle - React, Tailwind, and code Playground

by Chris Purves

HTML

<div id="card"></div>

CSS

#card {
    height: 400px;
    width: 200px;
    border: 3px solid blue;
    border-radius: 10px;
    background-color: tan;
    position: relative;
}

#card:before {
    content:"";
    height:0;
    width: 0;
    position: absolute;
    top:-3px;
    left:-3px;
    border-top: 35px solid blue;
    border-right: 35px solid transparent;
}

#card:after {
    content: "";
    height: 0;
    width: 0;
    position: absolute;
    top: -3px;
    left: -3px;
    border-top: 30px solid white;
    border-right: 30px solid transparent;
}