JSFiddle - React, Tailwind, and code Playground

HTML

<title>Read and Parse Lynis Log</title>

<script>

function processFiles(files) {
var file = files[0];
var reader = new FileReader();
var textParsed = [];

reader.onload = function (e) {
	// Cuando éste evento se dispara, los datos están ya disponibles.
	// Se trata de copiarlos a una área <div> en la página.
	var output = document.getElementById("fileOutput");
	output.textContent = e.target.result;
	
	var text = e.target.result;
	var lines = text.split("\n");
	
	for (i=0; i<lines.length; i++) {      
    	textParsed[i] = lines[i];
    	console.log(textParsed[i]); 
	} 
};
reader.readAsText(file);
}
</script>

<body>
<input id="fileInput" placeholder=":input" type="file" size="50" onchange="processFiles(this.files)">
<div id="fileOutput"></div>
	<div class="container">
            <ul id="nav">
                <li><a href="#"><img src="images/t1.png" /> Dashboard</a></li>
                <li><a href="#" class="sub" tabindex="1"><img src="images/t2.png" />Reporting</a><img src="images/up.gif" alt="" />
                    <ul>
                        <li><a href="#"><img src="images/empty.gif" />LYNIS LOG</a></li>
                        <li><a href="#"><img src="images/empty.gif" />LYNIS REPORT</a></li>
                    </ul>
                </li>
                <li><a href="#" class="sub" tabindex="1"><img src="images/t3.png" />Lynis Tests</a><img src="images/up.gif" alt="" />
                    <ul>
                        <li><a href="#"><img src="images/empty.gif" />Accounting</a></li>
                        <li><a href="#"><img src="images/empty.gif" />Authentication</a></li>
                        <li><a href="#"><img src="images/empty.gif" />Banner</a></li>
                        <li><a href="#"><img src="images/empty.gif" />Boot</a></li>
                        <li><a href="#"><img src="images/empty.gif" />Crypto</a></li>
                        <li><a href="#"><img src="images/empty.gif" />File Integrity</a></li>
                        <li><a...

CSS

*{
    margin:0;
    padding:0;
}

body {
    background-color:#bababa;
    color:#fff;
}

div#fileOutput{
    margin: auto;
    margin-top: 50px;
    margin-left: 250px;
    margin-right: 50px;
    margin-bottom: 50px;
    width: 960px;
    height: 800px;
    white-space: pre-line;
    border: solid 1px black;
    padding: 5px;
}

input[type="file"]{
    margin: auto;
    width: 960px;
    height: 50px;
    margin-left: 250px;
    white-space: pre-line;
    border: solid 1px black;
    padding: 5px;

}

#nav {
    border:3px solid #3e4547;
    box-shadow:2px 2px 8px #000000;
    border-radius:3px;
    -moz-border-radius:3px;
    -webkit-border-radius:3px;
    position: fixed;
    top: 0; left: 0;
}
#nav, #nav ul {
    list-style:none;
    padding:0;
    width:200px;
}
#nav ul {
    position:relative;
    z-index:-1;
}
#nav li {
    position:relative;
    z-index:100;
}
#nav ul li {
    margin-top:-23px;

    -moz-transition:  0.4s linear 0.4s;
    -ms-transition: 0.4s linear 0.4s;
    -o-transition: 0.4s linear 0.4s;
    -webkit-transition: 0.4s linear 0.4s;
    transition: 0.4s linear 0.4s;
}
#nav li a {
    background-color:#d4d5d8;
    color:#000;
    display:block;
    font-size:12px;
    font-weight:bold;
    line-height:28px;
    outline:0;
    padding-left:15px;
    text-decoration:none;
}
#nav li a.sub {
    background:#d4d5d8 url("../images/down.gif") no-repeat;
}
#nav li a + img {
    cursor:pointer;
    display:none;
    height:28px;
    left:0;
    position:absolute;
    top:0;
    width:200px;
}
#nav li a img {
    border-width:0px;
    height:24px;
    line-height:28px;
    margin-right:8px;
    vertical-align:middle;
    width:24px;
}
#nav li a:hover {
    background-color:#bcbdc1;
}
#nav ul li a {
    background-color:#eee;
    border-bottom:1px solid #ccc;
    color:#000;
    font-size:11px;
    line-height:22px;
}
#nav ul li a:hover {
    background-color:#ddd;
    color:#444;
}
#nav ul li a img {
    background: url("../images/bulb.png")...