JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Tests avec Javascript</title>
<style type="text/css">
body {background-color:#000;font-family:Verdana,Geneva,sans-serif;font-size:15px;color:white;}
.intro {font-size:25px;margin-left:100px;}
a {color:#6CC;text-decoration:none;font-weight:bold;}
a:visited {color:#6CC;}
a:hover {color:#6FF;}
a:active {color:#6FF;}
</style>
</head>

<body>
<p class="intro" id="introduction">Hello! <a href="#" onClick="couleur()">CLIQUEZ ICI pour changer la couleur du 1er paragraphe!</a>
<br />
<a href="#" onClick="resize()" id="resizer"></a></p>
<p id="para1">Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim adminim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor inreprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

<p id="para2">Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim adminim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor inreprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<script type="text/javascript">
function couleur (){
    var choix=prompt("Quelle couleur choisissez-vous?");
    switch(choix) {
    case "rouge":
    document.getElementById("para1").style.background= "red";
    document.getElementById("para1").style.color= "white";
    break;
    
    case...