Figuring out Dragula library usage

The library in use: https://cdnjs.cloudflare.com/ajax/libs/dragula/3.7.2/dragula.js
plus its CSS: https://cdnjs.cloudflare.com/ajax/libs/dragula/3.7.2/dragula.css

Default configuration

HTML body content

<ul class="container">
<li class="draggable">1</li>
<li class="draggable">2</li>
<li class="draggable">3</li>
</ul>
<ul class="container">
<li class="draggable">1</li>
<li class="draggable">2</li>
<li class="draggable">3</li>
</ul>
<ul class="container">
<li class="draggable">1</li>
<li class="draggable">2</li>
<li class="draggable">3</li>
</ul>

JavaScript content

var containers = Array.prototype.slice.call(document.querySelectorAll('.container'));
var drake = window.dragula(containers);

How it looks like

With its CSS	Without its CSS

See the fiddle for yourself!