Just a simple demonstration of parallax scrolling
JQuery base files are available via these cdn urls:
https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.js https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.min.js https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.min.map https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.slim.js https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.slim.min.js https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.1/jquery.slim.min.map