javascript - Scroll a div over top of a div above -

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i'm trying replicate effect seen on page: http://www.falve.co.nz/collection/

as scroll page white section beneath darker hero section scrolls on top of top hero section, curtain.

how replicate this? jquery thing or css position thing? unsure how approach this?

that called parallax effect , achieved through javascript.

here few resources can use own projects.


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