Removing WordPress Footer -without access to PHP code?

Tweaking it in the PHP code shouldn’t be too hard. You don’t need to really know any PHP at all. Just need to CTRL+F to find that phrase you want to remove.

But if you absolutely want to do it with just CSS, it is possible to hide it with {display:none}. The code will still load, but just be hidden from visibility to a user. You will need to find the class, id, or html element that contains that text though.