JSFiddle - React, Tailwind, and code Playground

by Masatoshi Ohta

HTML

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

CSS

body {
    margin: 20px;
}
.balloon {
    position: relative;
    padding: 10px;
    background-color: white;
    border: 2px solid black;
    border-radius: 10px;
}
.balloon:after, .balloon:before {
    content:"";
    position: absolute;
    top: 100%;
    height: 0;
    width: 0;
}
.balloon:after {
    left: 23px;
    border: 11px solid transparent;
    border-top: 11px solid white;
}
.balloon:before {
    left: 20px;
    border: 14px solid transparent;
    border-top: 14px solid black;
}