Generate a PDF from a webpage

I need to convert an webpage into a PDF with the click of a button. The page is an online learning activity with a drag and drop feature (created using Dragula). It also have some textarea objects, that must be converted too, but including the input inserted by the user. The page that must be converted is this: [login to view URL] The final result should be something similar to this: [login to view URL] Please contact me if you know how to do this.