How to Add Paralax Effect

To add paralax effect to a block or container click on the 'Block' button when you are on top of a block in your site. That will open the settings of the whole block, you can select an image for the background and click on the checkbox: 'Paralax Effect' that will enable the paralax for that image and block.

You have the option for Parallax Speed and Image Description for SEO purposes.