JSFiddle - React, Tailwind, and code Playground

by Dhanck

HTML

<div id="box" class="top-tile"></div>

CSS

#container-full {
    width: 10em;
    height: 6em;
    border: 4px solid #ccc;
    background-color: #fff;
    position: relative;
}

.container-full::before,
.container-full::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    border-color: transparent;
    border-style: solid;
}

.container-full::after {
    border-width: 1.35em;
    border-right-color: #0c0;
    border-bottom-color: #0c0;
}