<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>
<script src="https://raw.githack.com/creativetimofficial/now-ui-kit/master/assets/js/plugins/nouislider.min.js"></script>
<script src="https://raw.githack.com/creativetimofficial/now-ui-kit/master/assets/js/plugins/bootstrap-switch.js"></script>
</head>
<link href="https://fonts.googleapis.com/css?family=Montserrat:400,700,200" rel="stylesheet">
<div class="section section-basic mt-5" id="basic-elements">
<div class="container">
<div class="row" id="checkRadios">
<div class="col-sm-6 col-lg-3 mb-4">
<p class="category">Checkboxes</p>
<div class="form-check">
<label class="form-check-label">
<input class="form-check-input" type="checkbox">
<span class="form-check-sign"></span>
Unchecked
</label>
</div>
<div class="form-check">
<label class="form-check-label">
<input class="form-check-input" type="checkbox" checked="">
<span class="form-check-sign"></span>
Checked
</label>
</div>
<div class="form-check disabled">
<label class="form-check-label">
<input class="form-check-input" type="checkbox" disabled="">
<span class="form-check-sign"></span>
Disabled Unchecked
</label>
</div>
<div class="form-check disabled">