I've been trying to put a background image code for 2 days now and I can't get it to work I've changed the coding and different stuff very frustrating

https://www.freepik.com/free-photo/explosion-colored-powder-white-background_1193982.htm#query=jpg&position=26&from_view=search

Is the code idk

always save as on your pc/mobile upload to imgur.. take the code there