JSFiddle - React, Tailwind, and code Playground

HTML

<h1 id="TXT">MUDE O TEXTO</h1>
<input type="text" id="INPUT01" width="100%" /><br/>
<input type="button" onclick="setTexto('TXT')" value="MUDAR O TEXTO" />

CSS

body{
    font-family: 'segoe ui';
}

JavaScript

function setTexto(id){
    var tx=document.getElementById('INPUT01').value;
    document.getElementById(id).innerText=tx;
}