This code has been tested on the new Parallax Pro theme by StudioPress themes.
Where To Add The Code
Simply copy ALL the code from the view raw links and paste the PHP at the end of your child themes functions.php file and the CSS at the end of your child themes style.css file before the Media Queries using a text editor like Notepad++.
There’s also a few lines of CSS for Mobile Responsiveness that needs to be added to your Media Queries.