<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>
<head>
<title>Switch</title>
<meta charset="utf-8">
<style>
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
body,html{
height: 100%;
width: 100%;
}
body{
display: flex;
align-items: center;
justify-content: center;
margin: 0;
flex-direction:column;
}
.bg{
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: #ed1f24;
z-index: -1;
transition: background 0.5s linear;
}
input{
display: none;
