After adding a third party topbar my header is not sticky anymore on mobile

Kastello
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A while ago I added this topbar from a thirdparty on the mobile version of my shopify store. However ever since doing that my header is not sticky anymore.

I've tried everything with css but it just doesn't work. 

 

Does anyone know what css is neccesary to make sure the header will stay sticky on mobile when scrolling?

 

https://www.kastell.nl/

 

Your advice is much appreciated!!

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