JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>

<p><strong>Kinderen</strong>&nbsp;<i>tot 17 jaar en minimale lengte 1.30m <br><span id="pico-info">(het verjaardagsfeestje Pico Patat is voor kinderen vanaf 4 jaar en maximale lengte 1.30m)</span></i></p>


<p>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede mollis pretium. Integer tincidunt. Cras dapibus. Vivamus elementum semper nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu, consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet. Quisque rutrum. Aenean imperdiet. Etiam ultricies nisi vel augue. Curabitur ullamcorper ultricies nisi. Nam eget dui.
</p>



  <input type="checkbox" id="pck-94" value="94" name="packages[]">
    <label for="pck-94">
      <p>
        <strong id="pck-94-name">Verjaardagsfeestje Pico Patat</strong>                                                     2 uur klimmen op het Pico-Parcours (+ half uur instructie), entree Klimrijk, friet met frietsaus,snack,SiSi                                                                                                         ...

CSS

#pico-info {
  display: none;
}

JavaScript

$('#pck-94').click(function() {
            $('#pico-info').toggle(this.checked);
	$('body').scrollspy({ target: '#pico-info' });
            //$('[data-spy="scroll"]').each(function () {
            //    $(this).scrollspy('refresh');
            //})
        });