title: split background into 3 divs flippable
body: <p>I'm trying to apply a background into my html/css website but I also want to split this background into 3 divs who can flip when the cursor is hover.</p>
  <p>So I guess the best to do could be to make 3 divs side by side (the total size of my screen) then to apply 3 backgrounds to these 3 divs but each of them are a different part of my background image.</p>
  <p>Is anyone here can show me how to do that with a snippet please ?</p>