If you've been involved in front-end development for any time, you've probably heard the term 'parallax scrolling'. In this short video from my course Scroll Events Made Easy, I'll show you what parallax scrolling is and walk you through a few examples online.
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If you want a ready-made parallax scrolling solution, you could use one of the WordPress themes on Envato Market, like Parallax - Multipurpose Parallax Scrolling Theme.