Set google maps div position fixed

I need to set fixed Google Maps position div but, I have tried many different ways as well as stackoverflow answers but none of this solved my problem.

here there is a working example but i tried an doesn't work with my html: https://codepen.io/anon/pen/vOMgEV

here there is my non-working Fiddle: https://codepen.io/anon/pen/qjXmXy

I know this isn't the most useful question but I'm not a front-end developer and i need to solve this problem and I've tried for hours without any good result.

Thank you very much :)