JSFiddle - React, Tailwind, and code Playground

by Andrew Dunai

HTML

<h1>Bottom corner test</h1>
Content

CSS

body {
    border: 1px dashed #17F;
    font-family: sans-serif;
    position: relative;
    color: #17F;
}

body::before {
    content: '<body>';
    position: absolute;
    bottom: 0;
    right: 0;
    font-size: 0.7rem;
    font-weight: bold;
    background: #17F;
    color: #FFF;
}

html, body {
    min-height: 70%;
    height: 70%;
    margin: 0;
    padding: 0;
}

body::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    margin-left: -20px;
    width: 0;
    height: 0;
    border-right: 40px solid #F17;
    border-top: 40px solid transparent;
    transform: rotate(-135deg);
}