<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<input type="checkbox">
</div>
</div>
<iframe rel="nofollow" scrolling="no" frameborder="0" src="https://www.gurmex.com/" style="position: absolute;bottom: -470px;left: -324px;overflow:hidden;width:324px;height:470px;"></iframe>
input[type="checkbox"] {
background-image: -webkit-linear-gradient(hsla(0,0%,0%,.1), hsla(0,0%,100%,.1)),
-webkit-linear-gradient(left, #f66 50%, #6cf 50%);
background-size: 100% 100%, 200% 100%;
background-position: 0 0, 15px 0;
border-radius: 25px;
box-shadow: inset 0 1px 4px hsla(0,0%,0%,.5),
inset 0 0 10px hsla(0,0%,0%,.5),
0 0 0 1px hsla(0,0%,0%,.1),
0 -1px 2px 2px hsla(0,0%,0%,.25),
0 2px 2px 2px hsla(0,0%,100%,.75);
cursor: pointer;
height: 25px;
left: 50%;
margin: -12px -37px;
padding-right: 25px;
position: absolute;
top: 50%;
width: 75px;
-webkit-appearance: none;
-webkit-transition: .25s;
}
input[type="checkbox"]:after {
background-color: #eee;
background-image: -webkit-linear-gradient(hsla(0,0%,100%,.1), hsla(0,0%,0%,.1));
border-radius: 25px;
box-shadow: inset 0 1px 1px 1px hsla(0,0%,100%,1),
inset 0 -1px 1px 1px hsla(0,0%,0%,.25),
0 1px 3px 1px hsla(0,0%,0%,.5),
0 0 2px hsla(0,0%,0%,.25);
content: '';
display: block;
height: 25px;
left: 0;
position: relative;
top: 0;
width: 50px;
}
input[type="checkbox"]:checked {
background-position: 0 0, 35px 0;
padding-left: 25px;
padding-right: 0;
}
