how to set a single background image in multiple blocks of a page

Where is the callup of the background image in the HTML code? The thing is I want to change the background image to load from imagekit.io to load faster. I changed that within nicepage, but I DON'T...

If I use a photo as a background of a block, how can I position it (specially, if I want to add parallax effect) in certain position? At least e.g. top-left corner or “absolute center”….????

Hello, I added a new block and I need to change the background image then move to the left, I wasn't able to do that. Do you have video tutorials for that? Thanks for the...