JSFiddle - React, Tailwind, and code Playground

by Masatoshi Ohta

HTML

<h3 class="balloon">Hello</h3>

CSS

body {
    margin: 20px;
}
.balloon {
    position: relative;
    padding: 10px;
    color: #fff;
    background: gray;
    font-size: 20px;
    border-radius: 5px;
}
.balloon:after {
    position: absolute;
    content: "";
    top: 100%;
    left: 20px;
    height: 0;
    width: 0;
    border: 10px solid transparent;
    border-top: 10px solid gray;
}