How to import .scss properly

I have tried to import as a .scss overlay for my website’s page, but instead of that it just changes the background color of the section dividers. The snow effect is not present even in the sections with the changed background color. What would I have to change in order to achieve my desired result?

try like this

When I want any kind of “particle” effect on my sites, I use this tool…

Here’s a live example