JSFiddle - React, Tailwind, and code Playground

HTML

<div id = 'content'></div>
<button class= 'bt'>Mostrar</button>

CSS

#content {
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
    min-width: 100%;
    text-align: center;
    padding: 20px 0;
    background: rgba(0,0,0,0.2);
}

button {
    margin-top: 4px;
    padding: 6px 16px;
    border: 0 none;
    background: rgba(0, 150, 200, 1);
    color: #fff;
}

button:hover {
    cursor: pointer;
}

JavaScript

var el = document.querySelector('button');
el.addEventListener('click', function(){
    document.getElementById('content').innerHTML = 'Mostrando Texto...';
});