snap scroll to each section css functionality

hello,

I'm trying to get the snap scroll css feature working. As seen in this codepen example.  (I want to be able to snap scroll section to section vertically.) https://codepen.io/andyadams/pen/omLOqZ

As I understand it, you need to add the css to your container div and then to each section. (wasn't exactly sure what the container div is considered to be so I added that css to both collection and page.) I've added the css below but it doesn't work. Any help would be greatly appreciated! Thanks! Tom

#page {
   scroll-snap-type: y mandatory !important;
}
#collection-60885ba8dcf40e5d7af67055 {
  
  scroll-snap-type: y mandatory !important;
}

section[data-section-id="60885ba8dcf40e5d7af67057"] {
  
   scroll-snap-align: start !important;
  scroll-snap-stop: normal !important;
}
section[data-section-id="60885ba8dcf40e5d7af67059"]{
  
  scroll-snap-align: start !important;
  scroll-snap-stop: normal !important;
}