jquery in pagebuilder

I want to put some jquery in my pagebuilder page but i don’t know how.
I think i have the right code but i don’t know how to insert it in my page.

This is the jquery code:

$(window).scroll(function(){
      if ($(this).scrollTop() > 30 ) {
          $('.Fixed').addClass('#Fix');
      } else {
          $('.Fixed').removeClass('#Fix');
      }
  });

And this is the css code:

#Fix
{
position: fixed;
}

I hope someone can help me.