JSFiddle - React, Tailwind, and code Playground

HTML

<span>abc</span>
<span>no me</span>
<span>lo sé...</span>

CSS

span {
    position: relative;
    display: inline-block;
    padding: 10px 10px 15px;
    background: #ccc;
}

span:nth-child(1) { font-size: 1em }
span:nth-child(2) { font-size: 2em }
span:nth-child(3) { font-size: 3em }

span:after {
    position: absolute;
    left: calc(50% - 10px);
    bottom: 0;
    content: "\00a0";
    display: block;
    width: 0px;
    height: 0px;
    border-width:0px 10px 10px 10px;
    border-style: solid;
    border-color: transparent transparent white transparent;
}