Fill in the missing parts to create a "collapsible".
<button data-toggle="@(8)" data-target="@(5)">Collapsible</button>
<div id="demo" class="@(8)">
Lorem ipsum dolor text....
</div>
<button data-toggle="collapse" data-target="#demo">Collapsible</button>
<div id="demo" class="collapse">
Lorem ipsum dolor text....
</div>