title: Where Can i find animated volume bar in css
body: <p>After searching a lot on internet I can't find a way to get an animated volume bars like this website : <a href="https://my.pottermore.com/patronus" rel="nofollow">https://my.pottermore.com/patronus</a></p>
  
  <p>If anyone know how to create a button like this please let me know bellow.
  I tried much times but nothing worked properly.</p>
  
  <p>This is what I've done so far :</p>
  
  <pre><code>jsfiddle.net/dzk6uj7e/74/
  </code></pre>
  
  <p>Best regards,</p>