Do you have an example for a collapsible Navigation bar?
I doesn´t work exactly. Can you please take a look on my page?
Sure but wouldn’t I need more details and a link? 
Learn how to do it here: http://help.webflow.com/sharing-your-public-webflow-site-link
here is the link:
https://preview.webflow.com/preview/brixius?preview=2a458f83df3dbf4c8f3e813728a85657
Can you please help me and take a look at my website in webflow?