<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>
<div class="container">
<form>
<h1>Material Design formular</h1>
<div class="form-group">
<select>
<option></option>
<option>Value 1</option>
<option>Value 2</option>
</select>
<label for="select" class="control-label">Selectbox</label><i class="bar"></i>
</div>
<div class="form-group">
<input type="text" required="required"/>
<label for="input" class="control-label">Textfield</label><i class="bar"></i>
</div>
<div class="form-group">
<textarea required="required"></textarea>
<label for="textarea" class="control-label">Textarea</label><i class="bar"></i>
</div>
<div class="checkbox">
<label>
<input type="checkbox" checked="checked"/><i class="helper"></i>I'm the label from a checkbox
</label>
</div>
<div class="checkbox">
<label>
<input type="checkbox"/><i class="helper"></i>I'm the label from a checkbox
</label>
</div>
<div class="form-radio">