The collapsible piece you're talking about is specific to the Kentico UI. If you want that on your live site, you have to implement it using some jquery like so (not tested):
<script>
$(document).ready(function(){
$("a form-section").click(function(){
$("div .form-details").toggle();
});
});
</script>
<a class="form-section">Section 1</a>
<div class="form-detail">
form fields and text here
</div>