sticky element on scroll

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Hi, in this example https://test.laytheme.com/sticky/ there is a tree photo that sticky at the top.
How i can do this but when a new element scroll on it it will move out?
like the text :"Distinct, dynamic design to transform brands, institutions, and individuals." in this lay site:
https://www.standard-projects.com/
where i can found this option? Thanks

[arminunruh]

right click an element in the gridder, choose "make sticky"

https://www.instagram.com/p/CmG-curDQ_9/

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@arminunruh already tryed but dont' work i ve set in both values 30 px

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@arminunruh solved! missing custom row height