<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Loading</title>
<link href="css/bootstrap.min.css" rel="stylesheet">
<link href="css/style.css" rel="stylesheet">
<link href="fonts/stylesheet.css" rel="stylesheet">
<link rel="shortcut icon" type="image/x-icon" href="http://gifimage.net/wp-content/uploads/2017/06/loading-gif-13.gif">
</head>
<body>
<div class="wrapper">
<div class="container">
<div class="input">
<input id="myInput" type="text" placeholder="text"/>
<button onclick="myFunction()">Try it</button>
<ul class="print-css" id="text-print"></ul>
</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script>
function myFunction() {
var x = document.getElementById("myInput").value;
var text="";
var randomColor = "";
for (i = 0; i < x.length; i++) {
