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How to hide menu back at the top


#1

I have the idea of an menu like http://www.mms.com/us/characters/red made myself, with the video https://www.youtube.com/watch?v=a2Kp4bSDCwI

But how can I hide the menu when I am back at the top of the page?
Thanks to help me out

Karel

public link:
https://preview.webflow.com/preview/mms-karel?utm_source=mms-karel&preview=1edb394323ea06a4b181ebf35315f5bf