Help with 'heightStyle' in Accordion

Help with 'heightStyle' in Accordion

Hi,

Found the demo below useful for what I want to achieve with an accordion:
http://codepen.io/anon/pen/kLbeD

However, I'm not getting the expected results from the heightStyle of the content div.

My Fork:
http://codepen.io/anon/pen/GJbKjW

In my version I've just added differing amounts of text to the content divs.

I expected 'heightStyle: 'content' to set the height of each div to the height of the content, but it doesn't.
Instead, it seems to ignore this and behave as if it were 'heightStyle: 'auto' which is equal content heights (based on the tallest)?

Appreciate any advice.

Cheers